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<button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2501.01232">arXiv:2501.01232</a> <span> [<a href="https://arxiv.org/pdf/2501.01232">pdf</a>, <a href="https://arxiv.org/format/2501.01232">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> </div> <p class="title is-5 mathjax"> Measurement of $\rm ^{6}H$ ground state energy in an electron scattering experiment at MAMI-A1 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Shao%2C+T">Tianhao Shao</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+J">Jinhui Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Pochodzalla%2C+J">Josef Pochodzalla</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">Patrick Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Christmann%2C+M">Mirco Christmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">Michael O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Doria%2C+L">Luca Doria</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">Anselm Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Geratz%2C+J">Julian Geratz</a>, <a href="/search/nucl-ex?searchtype=author&query=Helmel%2C+C">Christian Helmel</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoek%2C+M">Matthias Hoek</a>, <a href="/search/nucl-ex?searchtype=author&query=Kino%2C+R">Ryoko Kino</a>, <a href="/search/nucl-ex?searchtype=author&query=Klag%2C+P">Pascal Klag</a>, <a href="/search/nucl-ex?searchtype=author&query=Ma%2C+Y">Yu-Gang Ma</a>, <a href="/search/nucl-ex?searchtype=author&query=Markus%2C+D">David Markus</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">Harald Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Mihovilovi%C4%8D%2C+M">Miha Mihovilovi膷</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">Ulrich M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Nagao%2C+S">Sho Nagao</a>, <a href="/search/nucl-ex?searchtype=author&query=Nakamura%2C+S+N">Satoshi N. Nakamura</a>, <a href="/search/nucl-ex?searchtype=author&query=Nishi%2C+K">Kotaro Nishi</a>, <a href="/search/nucl-ex?searchtype=author&query=Nishida%2C+K">Ken Nishida</a>, <a href="/search/nucl-ex?searchtype=author&query=Oura%2C+F">Fumiya Oura</a>, <a href="/search/nucl-ex?searchtype=author&query=P%C3%A4tschke%2C+J">Jonas P盲tschke</a>, <a href="/search/nucl-ex?searchtype=author&query=Schlimme%2C+B+S">Bj枚rn S枚ren Schlimme</a> , et al. (6 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2501.01232v1-abstract-short" style="display: inline;"> For the first time the neutron-rich hydrogen isotope $\rm ^{6}H$ was produced in an electron scattering experiment in the reaction $\rm ^{7}Li(e,~e'p蟺^{+})^{6}H$ using the spectrometer facility of the A1 Collaboration at the Mainz Microtron accelerator. By measuring the triple coincidence between the scattered electron, the produced proton, and $蟺^{+}$, the missing mass spectrum of $\rm ^{6}H$ was… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.01232v1-abstract-full').style.display = 'inline'; document.getElementById('2501.01232v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2501.01232v1-abstract-full" style="display: none;"> For the first time the neutron-rich hydrogen isotope $\rm ^{6}H$ was produced in an electron scattering experiment in the reaction $\rm ^{7}Li(e,~e'p蟺^{+})^{6}H$ using the spectrometer facility of the A1 Collaboration at the Mainz Microtron accelerator. By measuring the triple coincidence between the scattered electron, the produced proton, and $蟺^{+}$, the missing mass spectrum of $\rm ^{6}H$ was obtained. A clear peak above $^3$H+n+n+n energy threshold was seen resulting in a ground state energy of $\rm ^{6}H$ at $2.3\pm0.5({\rm stat.})\pm0.4({\rm syst.})$ MeV with a width of $1.9\pm1.0({\rm stat.})\pm0.4({\rm syst.})$ MeV. This work challenges the understandings of multi-nucleon interactions and presents a new method to study light neutron-rich nuclei with electron scattering experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.01232v1-abstract-full').style.display = 'none'; document.getElementById('2501.01232v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2025. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2406.16059">arXiv:2406.16059</a> <span> [<a href="https://arxiv.org/pdf/2406.16059">pdf</a>, <a href="https://arxiv.org/ps/2406.16059">ps</a>, <a href="https://arxiv.org/format/2406.16059">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> </div> <p class="title is-5 mathjax"> Measurement of the $\mathrm{{}^{12}C}(e,e')$ cross sections at $Q^2=0.8\,\mathrm{GeV}^2/c^2$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Mihovilovi%C4%8D%2C+M">M. Mihovilovi膷</a>, <a href="/search/nucl-ex?searchtype=author&query=Doria%2C+L">L. Doria</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Ankowski%2C+A+M">A. M. Ankowski</a>, <a href="/search/nucl-ex?searchtype=author&query=Bacca%2C+S">S. Bacca</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=Denig%2C+A">A. Denig</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Fri%C5%A1%C4%8Di%C4%87%2C+I">I. Fri拧膷i膰</a>, <a href="/search/nucl-ex?searchtype=author&query=Giusti%2C+C">C. Giusti</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoek%2C+M">M. Hoek</a>, <a href="/search/nucl-ex?searchtype=author&query=Kegel%2C+S">S. Kegel</a>, <a href="/search/nucl-ex?searchtype=author&query=Littich%2C+M">M. Littich</a>, <a href="/search/nucl-ex?searchtype=author&query=Megias%2C+G+D">G. D. Megias</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Muller%2C+U">U. Muller</a>, <a href="/search/nucl-ex?searchtype=author&query=Pochodzalla%2C+J">J. Pochodzalla</a>, <a href="/search/nucl-ex?searchtype=author&query=Schlimme%2C+B+S">B. S. Schlimme</a>, <a href="/search/nucl-ex?searchtype=author&query=Schoth%2C+M">M. Schoth</a>, <a href="/search/nucl-ex?searchtype=author&query=Sfienti%2C+C">C. Sfienti</a>, <a href="/search/nucl-ex?searchtype=author&query=%C5%A0irca%2C+S">S. 艩irca</a>, <a href="/search/nucl-ex?searchtype=author&query=Sobczyk%2C+J+E">J. E. Sobczyk</a>, <a href="/search/nucl-ex?searchtype=author&query=Stottinger%2C+Y">Y. Stottinger</a>, <a href="/search/nucl-ex?searchtype=author&query=Thiel%2C+M">M. Thiel</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2406.16059v1-abstract-short" style="display: inline;"> We present the findings of a study based on a new inelastic electron-scattering experiment on the ${}^{12}\mathrm{C}$ nucleus focusing on the kinematic region of $Q^2=0.8\,\mathrm{GeV}^2/{c}^2$. The measured cross section is sensitive to the transverse response function and provides a stringent test of theoretical models, as well as of the theoretical assumptions made in Monte-Carlo event-generato… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.16059v1-abstract-full').style.display = 'inline'; document.getElementById('2406.16059v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.16059v1-abstract-full" style="display: none;"> We present the findings of a study based on a new inelastic electron-scattering experiment on the ${}^{12}\mathrm{C}$ nucleus focusing on the kinematic region of $Q^2=0.8\,\mathrm{GeV}^2/{c}^2$. The measured cross section is sensitive to the transverse response function and provides a stringent test of theoretical models, as well as of the theoretical assumptions made in Monte-Carlo event-generator codes developed for the interpretation of neutrino-nucleus experiments, such as DUNE and HyperK. We find that modern generators such as GENIE and GiBUU reproduce our new experimental data within 10$\%$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.16059v1-abstract-full').style.display = 'none'; document.getElementById('2406.16059v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2311.01935">arXiv:2311.01935</a> <span> [<a href="https://arxiv.org/pdf/2311.01935">pdf</a>, <a href="https://arxiv.org/format/2311.01935">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> </div> <p class="title is-5 mathjax"> Nuclear density dependence of polarization transfer in quasi-elastic ${\rm A}(\vec{e},e' \vec{p})$ reactions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Kolar%2C+T">T. Kolar</a>, <a href="/search/nucl-ex?searchtype=author&query=Cosyn%2C+W">W. Cosyn</a>, <a href="/search/nucl-ex?searchtype=author&query=Giusti%2C+C">C. Giusti</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Ashkenazi%2C+A">A. Ashkenazi</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">R. B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=Brecelj%2C+T">T. Brecelj</a>, <a href="/search/nucl-ex?searchtype=author&query=Christmann%2C+M">M. Christmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Cohen%2C+E+O">E. O. Cohen</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Doria%2C+L">L. Doria</a>, <a href="/search/nucl-ex?searchtype=author&query=Eckert%2C+P">P. Eckert</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilman%2C+R">R. Gilman</a>, <a href="/search/nucl-ex?searchtype=author&query=Geimer%2C+J">J. Geimer</a>, <a href="/search/nucl-ex?searchtype=author&query=G%C3%BClker%2C+P">P. G眉lker</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoek%2C+M">M. Hoek</a>, <a href="/search/nucl-ex?searchtype=author&query=Izraeli%2C+D">D. Izraeli</a>, <a href="/search/nucl-ex?searchtype=author&query=Kegel%2C+S">S. Kegel</a>, <a href="/search/nucl-ex?searchtype=author&query=Klag%2C+P">P. Klag</a>, <a href="/search/nucl-ex?searchtype=author&query=Kohl%2C+Y">Y. Kohl</a>, <a href="/search/nucl-ex?searchtype=author&query=Korover%2C+I">I. Korover</a>, <a href="/search/nucl-ex?searchtype=author&query=Lichtenstadt%2C+J">J. Lichtenstadt</a>, <a href="/search/nucl-ex?searchtype=author&query=Littich%2C+M">M. Littich</a> , et al. (30 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2311.01935v3-abstract-short" style="display: inline;"> The ratio of the transverse and longitudinal component of polarization transfer to protons in the quasi-elastic $(\vec{e}, e^{\prime} \vec{p}\,)$ reaction, $P^{\prime}_x/P^{\prime}_z$, is sensitive to the proton's electromagnetic form factor ratio, $G_E/G_M$. To explore density-dependent in-medium modifications, a comparison of polarization transfer ratios involving protons from distinct nuclear s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.01935v3-abstract-full').style.display = 'inline'; document.getElementById('2311.01935v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.01935v3-abstract-full" style="display: none;"> The ratio of the transverse and longitudinal component of polarization transfer to protons in the quasi-elastic $(\vec{e}, e^{\prime} \vec{p}\,)$ reaction, $P^{\prime}_x/P^{\prime}_z$, is sensitive to the proton's electromagnetic form factor ratio, $G_E/G_M$. To explore density-dependent in-medium modifications, a comparison of polarization transfer ratios involving protons from distinct nuclear shells, each with different local nuclear densities, has been proposed. In this study, we present such comparisons between four shells, $1s_{1/2}$, $1p_{3/2}$ in $^{12}\mathrm{C}$ and $1d_{3/2}$, $2s_{1/2}$ in $^{40}\mathrm{Ca}$. In an effort to account for other many-body effects that may differ between shells, we use a state-of-the-art relativistic distorted-wave impulse-approximation (RDWIA) calculation and present the double ratios, $(P^{\prime}_x/P^{\prime}_z)_{\rm Data}/(P^{\prime}_x/P^{\prime}_z)_{\rm RDWIA}$ as well as the super ratios, $\left[(P^{\prime}_x/P^{\prime}_z)_{\rm A}/(P^{\prime}_x/P^{\prime}_z)_{\rm B}\right]_{\rm Data}/\left[(P^{\prime}_x/P^{\prime}_z)_{\rm A}/(P^{\prime}_x/P^{\prime}_z)_{\rm B}\right]_{\rm RDWIA}$, for chosen shells A and B, as a function of effective local nuclear densities. We find that double ratios for individual shells show a dependence on the probed effective nuclear densities. Studying the ratios, we observed a systematic variation between pairs of higher- and lower-density shells. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.01935v3-abstract-full').style.display = 'none'; document.getElementById('2311.01935v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 3 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2306.05565">arXiv:2306.05565</a> <span> [<a href="https://arxiv.org/pdf/2306.05565">pdf</a>, <a href="https://arxiv.org/format/2306.05565">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2023.138309">10.1016/j.physletb.2023.138309 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of polarization transfer in the quasi-elastic $^{40}{\rm Ca}(\vec{e},e' \vec{p})$ process </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Kolar%2C+T">T. Kolar</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Christmann%2C+M">M. Christmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Doria%2C+L">L. Doria</a>, <a href="/search/nucl-ex?searchtype=author&query=Eckert%2C+P">P. Eckert</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Giusti%2C+C">C. Giusti</a>, <a href="/search/nucl-ex?searchtype=author&query=Geimer%2C+J">J. Geimer</a>, <a href="/search/nucl-ex?searchtype=author&query=G%C3%BClker%2C+P">P. G眉lker</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoek%2C+M">M. Hoek</a>, <a href="/search/nucl-ex?searchtype=author&query=Klag%2C+P">P. Klag</a>, <a href="/search/nucl-ex?searchtype=author&query=Lichtenstadt%2C+J">J. Lichtenstadt</a>, <a href="/search/nucl-ex?searchtype=author&query=Littich%2C+M">M. Littich</a>, <a href="/search/nucl-ex?searchtype=author&query=Manoussos%2C+T">T. Manoussos</a>, <a href="/search/nucl-ex?searchtype=author&query=Markus%2C+D">D. Markus</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Mihovilovi%C4%8D%2C+M">M. Mihovilovi膷</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+J">J. M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">U. M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=P%C3%A4tschke%2C+J">J. P盲tschke</a>, <a href="/search/nucl-ex?searchtype=author&query=Paul%2C+S+J">S. J. Paul</a>, <a href="/search/nucl-ex?searchtype=author&query=Plura%2C+E+P+S">E. Piasetzky S. Plura</a>, <a href="/search/nucl-ex?searchtype=author&query=Pochodzalla%2C+J">J. Pochodzalla</a>, <a href="/search/nucl-ex?searchtype=author&query=Po%C5%BEun%2C+M">M. Po啪un</a> , et al. (10 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2306.05565v2-abstract-short" style="display: inline;"> Polarization transfer to a bound proton in polarized electron knock-out reactions, $\mathrm{A}(\vec{e},e^{\prime}\vec{p})$, is a powerful tool to look for in-medium modification of the bound proton. It requires comparison to calculations which consider the many-body effects accompanying the quasi-free process. We report here measured components $P_x^{\prime}$, $P_z^{\prime}$, and their ratio… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.05565v2-abstract-full').style.display = 'inline'; document.getElementById('2306.05565v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2306.05565v2-abstract-full" style="display: none;"> Polarization transfer to a bound proton in polarized electron knock-out reactions, $\mathrm{A}(\vec{e},e^{\prime}\vec{p})$, is a powerful tool to look for in-medium modification of the bound proton. It requires comparison to calculations which consider the many-body effects accompanying the quasi-free process. We report here measured components $P_x^{\prime}$, $P_z^{\prime}$, and their ratio $P_x^{\prime}/P_z^{\prime}$, of polarization transfer to protons bound in $^{40}\mathrm{Ca}$, which is described well by the shell model and for which reliable calculations are available. While the calculations capture the essence of the data, our statistical precision allows us to observe deviations which cannot be explained by simple scaling, including by varying the proton electromagnetic form factor ratio $G_E/G_M$. We further explore the deviations of the ratio of the polarization transfer components from that of a free proton, $(P_x^{\prime}/P_z^{\prime})_{\rm A}/(P_x^{\prime}/P_z^{\prime})_{\rm H}$, and its dependence on the bound-proton virtuality. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.05565v2-abstract-full').style.display = 'none'; document.getElementById('2306.05565v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 April, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.12196">arXiv:2303.12196</a> <span> [<a href="https://arxiv.org/pdf/2303.12196">pdf</a>, <a href="https://arxiv.org/format/2303.12196">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Non-forward radiative corrections to electron-carbon scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Mihovilovi%C4%8D%2C+M">M. Mihovilovi膷</a>, <a href="/search/nucl-ex?searchtype=author&query=Weber%2C+A+B">A. B. Weber</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Bajec%2C+M">M. Bajec</a>, <a href="/search/nucl-ex?searchtype=author&query=Beranek%2C+T">T. Beranek</a>, <a href="/search/nucl-ex?searchtype=author&query=Beri%C4%8Di%C4%8D%2C+J">J. Beri膷i膷</a>, <a href="/search/nucl-ex?searchtype=author&query=Bernauer%2C+J+C">J. C. Bernauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">R. B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Cardinali%2C+M">M. Cardinali</a>, <a href="/search/nucl-ex?searchtype=author&query=Correa%2C+L">L. Correa</a>, <a href="/search/nucl-ex?searchtype=author&query=Debenjak%2C+L">L. Debenjak</a>, <a href="/search/nucl-ex?searchtype=author&query=Denig%2C+A">A. Denig</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Bondy%2C+M+I+F">M. I. Feretti Bondy</a>, <a href="/search/nucl-ex?searchtype=author&query=Fonvieille%2C+H">H. Fonvieille</a>, <a href="/search/nucl-ex?searchtype=author&query=Friedrich%2C+J+M">J. M. Friedrich</a>, <a href="/search/nucl-ex?searchtype=author&query=Fri%C5%A1%C4%8Di%C4%87%2C+I">I. Fri拧膷i膰</a>, <a href="/search/nucl-ex?searchtype=author&query=Griffioen%2C+K">K. Griffioen</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoek%2C+M">M. Hoek</a>, <a href="/search/nucl-ex?searchtype=author&query=Kegel%2C+S">S. Kegel</a>, <a href="/search/nucl-ex?searchtype=author&query=Middleton%2C+D+G">D. G. Middleton</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">U. M眉ller</a> , et al. (15 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2303.12196v1-abstract-short" style="display: inline;"> Radiative corrections to elastic scattering represent an important part of the interpretation of electron-induced nuclear reactions at small energy transfers, where they make for a dominant part of background. Here we present and validate a new event generator for mimicking QED radiative processes in electron-carbon scattering that exactly calculates the coherent sum of the Bethe-Heitler amplitude… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.12196v1-abstract-full').style.display = 'inline'; document.getElementById('2303.12196v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.12196v1-abstract-full" style="display: none;"> Radiative corrections to elastic scattering represent an important part of the interpretation of electron-induced nuclear reactions at small energy transfers, where they make for a dominant part of background. Here we present and validate a new event generator for mimicking QED radiative processes in electron-carbon scattering that exactly calculates the coherent sum of the Bethe-Heitler amplitudes for the leading diagrams and can be reliably employed for a more robust determination of inelastic cross-sections. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.12196v1-abstract-full').style.display = 'none'; document.getElementById('2303.12196v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2212.11139">arXiv:2212.11139</a> <span> [<a href="https://arxiv.org/pdf/2212.11139">pdf</a>, <a href="https://arxiv.org/format/2212.11139">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-6596/2482/1/012016">10.1088/1742-6596/2482/1/012016 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> High accuracy synchrotron radiation interferometry with relativistic electrons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Klag%2C+P">P. Klag</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Akiyama%2C+T">T. Akiyama</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">R. B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Doria%2C+L">L. Doria</a>, <a href="/search/nucl-ex?searchtype=author&query=Eckert%2C+P">P. Eckert</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Geratz%2C+J">J. Geratz</a>, <a href="/search/nucl-ex?searchtype=author&query=Gogami%2C+T">T. Gogami</a>, <a href="/search/nucl-ex?searchtype=author&query=Helmel%2C+C">C. Helmel</a>, <a href="/search/nucl-ex?searchtype=author&query=Herrmann%2C+P">P. Herrmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoek%2C+M">M Hoek</a>, <a href="/search/nucl-ex?searchtype=author&query=Kaneta%2C+M">M. Kaneta</a>, <a href="/search/nucl-ex?searchtype=author&query=Konishi%2C+Y">Y. Konishi</a>, <a href="/search/nucl-ex?searchtype=author&query=Kino%2C+R">R. Kino</a>, <a href="/search/nucl-ex?searchtype=author&query=Lauth%2C+W">W. Lauth</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Mizuno%2C+M">M. Mizuno</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">U. M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Nagao%2C+S">S. Nagao</a>, <a href="/search/nucl-ex?searchtype=author&query=Nakamura%2C+S+N">S. N. Nakamura</a>, <a href="/search/nucl-ex?searchtype=author&query=Okuyama%2C+K">K. Okuyama</a>, <a href="/search/nucl-ex?searchtype=author&query=Pochodzalla%2C+J">J. Pochodzalla</a>, <a href="/search/nucl-ex?searchtype=author&query=Schlimme%2C+B+S">B. S. Schlimme</a> , et al. (6 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2212.11139v1-abstract-short" style="display: inline;"> A high-precision hypernuclear experiment has been performed at the Mainz Microtron (MAMI) to determine the hypertriton 螞 binding energy via decay-pion spectroscopy. A key element of this measurement is an accurate calibration of the magnetic spectrometers with the MAMI beam. For such an absolute calibration with small statistical and systematic uncertainties the undulator light interference method… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.11139v1-abstract-full').style.display = 'inline'; document.getElementById('2212.11139v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2212.11139v1-abstract-full" style="display: none;"> A high-precision hypernuclear experiment has been performed at the Mainz Microtron (MAMI) to determine the hypertriton 螞 binding energy via decay-pion spectroscopy. A key element of this measurement is an accurate calibration of the magnetic spectrometers with the MAMI beam. For such an absolute calibration with small statistical and systematic uncertainties the undulator light interference method will be applied. In this contribution the basic principle of this method is discussed and the analysis status of the measured synchrotron radiation spectra is presented <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.11139v1-abstract-full').style.display = 'none'; document.getElementById('2212.11139v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">The 13th Biennial Conference on Classical and Quantum Relativistic Dynamics of Particles and Fields (IARD22)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2208.13689">arXiv:2208.13689</a> <span> [<a href="https://arxiv.org/pdf/2208.13689">pdf</a>, <a href="https://arxiv.org/format/2208.13689">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.106.044610">10.1103/PhysRevC.106.044610 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Low-$Q^2$ elastic electron-proton scattering using a gas jet target </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Wang%2C+Y">Y. Wang</a>, <a href="/search/nucl-ex?searchtype=author&query=Bernauer%2C+J+C">J. C. Bernauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Schlimme%2C+B+S">B. S. Schlimme</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Aulenbacher%2C+S">S. Aulenbacher</a>, <a href="/search/nucl-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/nucl-ex?searchtype=author&query=Biroth%2C+M">M. Biroth</a>, <a href="/search/nucl-ex?searchtype=author&query=Bonaventura%2C+D">D. Bonaventura</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=Brand%2C+P">P. Brand</a>, <a href="/search/nucl-ex?searchtype=author&query=Caiazza%2C+S">S. Caiazza</a>, <a href="/search/nucl-ex?searchtype=author&query=Christmann%2C+M">M. Christmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Cline%2C+E">E. Cline</a>, <a href="/search/nucl-ex?searchtype=author&query=Denig%2C+A">A. Denig</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Doria%2C+L">L. Doria</a>, <a href="/search/nucl-ex?searchtype=author&query=Eckert%2C+P">P. Eckert</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Friscic%2C+I">I. Friscic</a>, <a href="/search/nucl-ex?searchtype=author&query=Gagneur%2C+S">S. Gagneur</a>, <a href="/search/nucl-ex?searchtype=author&query=Geimer%2C+J">J. Geimer</a>, <a href="/search/nucl-ex?searchtype=author&query=Grieser%2C+S">S. Grieser</a>, <a href="/search/nucl-ex?searchtype=author&query=Gulker%2C+P">P. Gulker</a>, <a href="/search/nucl-ex?searchtype=author&query=Herrmann%2C+P">P. Herrmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoek%2C+M">M. Hoek</a> , et al. (32 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2208.13689v1-abstract-short" style="display: inline;"> In this paper, we describe an experiment measuring low-$Q^2$ elastic electron-proton scattering using a newly developed cryogenic supersonic gas jet target in the A1 three-spectrometer facility at the Mainz Microtron. We measured the proton electric form factor within the four-momentum transfer range of $0.01\le Q^2 \le 0.045(\text{GeV/c})^2$. The experiment showed consistent results with the exis… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.13689v1-abstract-full').style.display = 'inline'; document.getElementById('2208.13689v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2208.13689v1-abstract-full" style="display: none;"> In this paper, we describe an experiment measuring low-$Q^2$ elastic electron-proton scattering using a newly developed cryogenic supersonic gas jet target in the A1 three-spectrometer facility at the Mainz Microtron. We measured the proton electric form factor within the four-momentum transfer range of $0.01\le Q^2 \le 0.045(\text{GeV/c})^2$. The experiment showed consistent results with the existing measurements. The data we collected demonstrated the feasibility of the gas jet target and the potential of future scattering experiments using high-resolution spectrometers with this gas jet target. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.13689v1-abstract-full').style.display = 'none'; document.getElementById('2208.13689v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 August, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 8 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2201.02368">arXiv:2201.02368</a> <span> [<a href="https://arxiv.org/pdf/2201.02368">pdf</a>, <a href="https://arxiv.org/format/2201.02368">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Data Analysis, Statistics and Probability">physics.data-an</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Systematic treatment of hypernuclear data and application to the hypertriton </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Eckert%2C+P">P. Eckert</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Fontbote%2C+M+A">M. Aragones Fontbote</a>, <a href="/search/nucl-ex?searchtype=author&query=Akiyama%2C+T">T. Akiyama</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Geratz%2C+J">J. Geratz</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoek%2C+M">M. Hoek</a>, <a href="/search/nucl-ex?searchtype=author&query=Itabashi%2C+K">K. Itabashi</a>, <a href="/search/nucl-ex?searchtype=author&query=Kaneta%2C+M">M. Kaneta</a>, <a href="/search/nucl-ex?searchtype=author&query=Kino%2C+R">R. Kino</a>, <a href="/search/nucl-ex?searchtype=author&query=Klag%2C+P">P. Klag</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Mizuno%2C+M">M. Mizuno</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+J">J. M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">U. M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Nagao%2C+S">S. Nagao</a>, <a href="/search/nucl-ex?searchtype=author&query=Nakamura%2C+S+N">S. N. Nakamura</a>, <a href="/search/nucl-ex?searchtype=author&query=Nakamura%2C+Y+R">Y. R. Nakamura</a>, <a href="/search/nucl-ex?searchtype=author&query=Okuyama%2C+K">K. Okuyama</a>, <a href="/search/nucl-ex?searchtype=author&query=Pochodzalla%2C+J">J. Pochodzalla</a>, <a href="/search/nucl-ex?searchtype=author&query=Schlimme%2C+B+S">B. S. Schlimme</a>, <a href="/search/nucl-ex?searchtype=author&query=Sfienti%2C+C">C. Sfienti</a>, <a href="/search/nucl-ex?searchtype=author&query=Spreckels%2C+R">R. Spreckels</a>, <a href="/search/nucl-ex?searchtype=author&query=Steinen%2C+M">M. Steinen</a> , et al. (4 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2201.02368v1-abstract-short" style="display: inline;"> A database is under construction to provide a complete collection of published basic properties of hypernuclei such as 螞 binding energies, lifetimes, or excitation energies. From these values, averages with related errors are computed in a systematic way. For each property, the overall experimental situation is depicted in form of an ideogram showing the combined probability density function of th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.02368v1-abstract-full').style.display = 'inline'; document.getElementById('2201.02368v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2201.02368v1-abstract-full" style="display: none;"> A database is under construction to provide a complete collection of published basic properties of hypernuclei such as 螞 binding energies, lifetimes, or excitation energies. From these values, averages with related errors are computed in a systematic way. For each property, the overall experimental situation is depicted in form of an ideogram showing the combined probability density function of the measurements. The database is accessible via a dynamic website at https://hypernuclei.kph.uni-mainz.de with an user interface offering customizable visualizations, selections, or unit conversions. The capabilities of the database are demonstrated for the puzzling and disputed data situation of the hypertriton. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.02368v1-abstract-full').style.display = 'none'; document.getElementById('2201.02368v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 3 figures, HADRON 2021 Proceeding</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2112.10582">arXiv:2112.10582</a> <span> [<a href="https://arxiv.org/pdf/2112.10582">pdf</a>, <a href="https://arxiv.org/format/2112.10582">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> </div> <p class="title is-5 mathjax"> Measurement of the 伪-particle monopole transition form factor challenges theory: a low-energy puzzle for nuclear forces? </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Kegel%2C+S">S. Kegel</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Bacca%2C+S">S. Bacca</a>, <a href="/search/nucl-ex?searchtype=author&query=Barnea%2C+N">N. Barnea</a>, <a href="/search/nucl-ex?searchtype=author&query=Bericic%2C+J">J. Bericic</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=Correa%2C+L">L. Correa</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Fonvieille%2C+H">H. Fonvieille</a>, <a href="/search/nucl-ex?searchtype=author&query=Friscic%2C+I">I. Friscic</a>, <a href="/search/nucl-ex?searchtype=author&query=Heilig%2C+M">M. Heilig</a>, <a href="/search/nucl-ex?searchtype=author&query=Herrmann%2C+P">P. Herrmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoek%2C+M">M. Hoek</a>, <a href="/search/nucl-ex?searchtype=author&query=Klag%2C+P">P. Klag</a>, <a href="/search/nucl-ex?searchtype=author&query=Kolar%2C+T">T. Kolar</a>, <a href="/search/nucl-ex?searchtype=author&query=Leidemann%2C+W">W. Leidemann</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Mihovilovic%2C+M">M. Mihovilovic</a>, <a href="/search/nucl-ex?searchtype=author&query=Mueller%2C+J">J. Mueller</a>, <a href="/search/nucl-ex?searchtype=author&query=Mueller%2C+U">U. Mueller</a>, <a href="/search/nucl-ex?searchtype=author&query=Orlandini%2C+G">G. Orlandini</a>, <a href="/search/nucl-ex?searchtype=author&query=Pochodzalla%2C+J">J. Pochodzalla</a>, <a href="/search/nucl-ex?searchtype=author&query=Schlimme%2C+B+S">B. S. Schlimme</a>, <a href="/search/nucl-ex?searchtype=author&query=Schoth%2C+M">M. Schoth</a> , et al. (8 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2112.10582v1-abstract-short" style="display: inline;"> We perform a systematic study of the $伪$-particle excitation from its ground state $0_1^+$ to the $0_2^+$ resonance. The so-called monopole transition form factor is investigated via an electron scattering experiment in a broad $Q^2$-range (from $0.5$ to $5.0$ fm$^{-2}$). The precision of the new data dramatically superseeds that of older sets of data, each covering only a portion of the $Q^2$-ran… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.10582v1-abstract-full').style.display = 'inline'; document.getElementById('2112.10582v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2112.10582v1-abstract-full" style="display: none;"> We perform a systematic study of the $伪$-particle excitation from its ground state $0_1^+$ to the $0_2^+$ resonance. The so-called monopole transition form factor is investigated via an electron scattering experiment in a broad $Q^2$-range (from $0.5$ to $5.0$ fm$^{-2}$). The precision of the new data dramatically superseeds that of older sets of data, each covering only a portion of the $Q^2$-range. The new data allow the determination of two coefficients in a low-momentum expansion leading to a new puzzle. By confronting experiment to state-of-the-art theoretical calculations we observe that modern nuclear forces, including those derived within chiral effective field theory which are well tested on a variety of observables, fail to reproduce the excitation of the $伪$-particle. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.10582v1-abstract-full').style.display = 'none'; document.getElementById('2112.10582v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 December, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2107.00763">arXiv:2107.00763</a> <span> [<a href="https://arxiv.org/pdf/2107.00763">pdf</a>, <a href="https://arxiv.org/format/2107.00763">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2021.136798">10.1016/j.physletb.2021.136798 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurements of the electron-helicity asymmetry in the quasi-elastic ${\rm A}(\vec{e},e' p)$ process </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Kolar%2C+T">Tim Kolar</a>, <a href="/search/nucl-ex?searchtype=author&query=Paul%2C+S+J">Sebouh J. Paul</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">Patrick Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Arenh%C3%B6vel%2C+H">Hartmuth Arenh枚vel</a>, <a href="/search/nucl-ex?searchtype=author&query=Ashkenazi%2C+A">Adi Ashkenazi</a>, <a href="/search/nucl-ex?searchtype=author&query=Beri%C4%8Di%C4%8D%2C+J">Jure Beri膷i膷</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">Ralph B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">Damir Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=Brecelj%2C+T">Tilen Brecelj</a>, <a href="/search/nucl-ex?searchtype=author&query=Cline%2C+E">Ethan Cline</a>, <a href="/search/nucl-ex?searchtype=author&query=Cohen%2C+E+O">Erez O. Cohen</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">Michael O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">Anselm Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Fri%C5%A1%C4%8Di%C4%87%2C+I">Ivica Fri拧膷i膰</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilman%2C+R">Ronald Gilman</a>, <a href="/search/nucl-ex?searchtype=author&query=Giusti%2C+C">Carlotta Giusti</a>, <a href="/search/nucl-ex?searchtype=author&query=Heilig%2C+M">Matthias Heilig</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoek%2C+M">Matthias Hoek</a>, <a href="/search/nucl-ex?searchtype=author&query=Izraeli%2C+D">David Izraeli</a>, <a href="/search/nucl-ex?searchtype=author&query=Kegel%2C+S">Simon Kegel</a>, <a href="/search/nucl-ex?searchtype=author&query=Klag%2C+P">Pascal Klag</a>, <a href="/search/nucl-ex?searchtype=author&query=Korover%2C+I">Igor Korover</a>, <a href="/search/nucl-ex?searchtype=author&query=Lichtenstadt%2C+J">Jechiel Lichtenstadt</a>, <a href="/search/nucl-ex?searchtype=author&query=Mardor%2C+I">Israel Mardor</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">Harald Merkel</a> , et al. (21 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2107.00763v1-abstract-short" style="display: inline;"> We present measurements of the electron helicity asymmetry in quasi-elastic proton knockout from $^{2}$H and $^{12}$C nuclei by polarized electrons. This asymmetry depends on the fifth structure function, is antisymmetric with respect to the scattering plane, and vanishes in the absence of final-state interactions, and thus it provides a sensitive tool for their study. Our kinematics cover the ful… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.00763v1-abstract-full').style.display = 'inline'; document.getElementById('2107.00763v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2107.00763v1-abstract-full" style="display: none;"> We present measurements of the electron helicity asymmetry in quasi-elastic proton knockout from $^{2}$H and $^{12}$C nuclei by polarized electrons. This asymmetry depends on the fifth structure function, is antisymmetric with respect to the scattering plane, and vanishes in the absence of final-state interactions, and thus it provides a sensitive tool for their study. Our kinematics cover the full range in off-coplanarity angle $蠁_{pq}$, with a polar angle $胃_{pq}$ coverage up to about 8 degrees. The missing energy resolution enabled us to determine the asymmetries for knock-out resulting in different states of the residual $^{11}$B system. We find that the helicity asymmetry for $p$-shell knockout from $^{12}$C depends on the final state of the residual system and is relatively large (up to $\approx 0.16$), especially at low missing momentum. It is considerably smaller (up to $\approx 0.01$) for $s$-shell knockout from both $^{12}$C and $^2$H. The data for $^2$H are in very good agreement with theoretical calculations, while the predictions for $^{12}$C exhibit differences with respect to the data. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.00763v1-abstract-full').style.display = 'none'; document.getElementById('2107.00763v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 July, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2104.13503">arXiv:2104.13503</a> <span> [<a href="https://arxiv.org/pdf/2104.13503">pdf</a>, <a href="https://arxiv.org/format/2104.13503">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2021.165668">10.1016/j.nima.2021.165668 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Operation and characterization of a windowless gas jet target in high-intensity electron beams </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Schlimme%2C+B+S">B. S. Schlimme</a>, <a href="/search/nucl-ex?searchtype=author&query=Aulenbacher%2C+S">S. Aulenbacher</a>, <a href="/search/nucl-ex?searchtype=author&query=Brand%2C+P">P. Brand</a>, <a href="/search/nucl-ex?searchtype=author&query=Littich%2C+M">M. Littich</a>, <a href="/search/nucl-ex?searchtype=author&query=Wang%2C+Y">Y. Wang</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Ball%2C+M">M. Ball</a>, <a href="/search/nucl-ex?searchtype=author&query=Bernauer%2C+J+C">J. C. Bernauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Biroth%2C+M">M. Biroth</a>, <a href="/search/nucl-ex?searchtype=author&query=Bonaventura%2C+D">D. Bonaventura</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=Caiazza%2C+S">S. Caiazza</a>, <a href="/search/nucl-ex?searchtype=author&query=Christmann%2C+M">M. Christmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Cline%2C+E">E. Cline</a>, <a href="/search/nucl-ex?searchtype=author&query=Denig%2C+A">A. Denig</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Doria%2C+L">L. Doria</a>, <a href="/search/nucl-ex?searchtype=author&query=Eckert%2C+P">P. Eckert</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Fri%C5%A1%C4%8Di%C4%87%2C+I">I. Fri拧膷i膰</a>, <a href="/search/nucl-ex?searchtype=author&query=Gagneur%2C+S">S. Gagneur</a>, <a href="/search/nucl-ex?searchtype=author&query=Geimer%2C+J">J. Geimer</a>, <a href="/search/nucl-ex?searchtype=author&query=Grieser%2C+S">S. Grieser</a>, <a href="/search/nucl-ex?searchtype=author&query=G%C3%BClker%2C+P">P. G眉lker</a>, <a href="/search/nucl-ex?searchtype=author&query=Herrmann%2C+P">P. Herrmann</a> , et al. (32 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2104.13503v2-abstract-short" style="display: inline;"> A cryogenic supersonic gas jet target was developed for the MAGIX experiment at the high-intensity electron accelerator MESA. It will be operated as an internal, windowless target in the energy-recovering recirculation arc of the accelerator with different target gases, e.g., hydrogen, deuterium, helium, oxygen, argon, or xenon. Detailed studies have been carried out at the existing A1 multi-spect… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.13503v2-abstract-full').style.display = 'inline'; document.getElementById('2104.13503v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2104.13503v2-abstract-full" style="display: none;"> A cryogenic supersonic gas jet target was developed for the MAGIX experiment at the high-intensity electron accelerator MESA. It will be operated as an internal, windowless target in the energy-recovering recirculation arc of the accelerator with different target gases, e.g., hydrogen, deuterium, helium, oxygen, argon, or xenon. Detailed studies have been carried out at the existing A1 multi-spectrometer facility at the electron accelerator MAMI. This paper focuses on the developed handling procedures and diagnostic tools, and on the performance of the gas jet target under beam conditions. Considering the special features of this type of target, it proves to be well suited for a new generation of high-precision electron scattering experiments at high-intensity electron accelerators. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.13503v2-abstract-full').style.display = 'none'; document.getElementById('2104.13503v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 July, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 April, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2008.08958">arXiv:2008.08958</a> <span> [<a href="https://arxiv.org/pdf/2008.08958">pdf</a>, <a href="https://arxiv.org/ps/2008.08958">ps</a>, <a href="https://arxiv.org/format/2008.08958">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.103.025205">10.1103/PhysRevC.103.025205 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the Generalized Polarizabilities of the Proton at Intermediate $Q^2$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Fonvieille%2C+H">H. Fonvieille</a>, <a href="/search/nucl-ex?searchtype=author&query=Beri%C4%8Di%C4%8D%2C+J">J. Beri膷i膷</a>, <a href="/search/nucl-ex?searchtype=author&query=Correa%2C+L">L. Correa</a>, <a href="/search/nucl-ex?searchtype=author&query=Benali%2C+M">M. Benali</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Bernauer%2C+J+C">J. C. Bernauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Blomberg%2C+A">A. Blomberg</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">R. B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=Debenjak%2C+L">L. Debenjak</a>, <a href="/search/nucl-ex?searchtype=author&query=Denig%2C+A">A. Denig</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Downie%2C+E+J">E. J. Downie</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Fri%C5%A1%C4%8Di%C4%87%2C+I">I. Fri拧膷i膰</a>, <a href="/search/nucl-ex?searchtype=author&query=Kegel%2C+S">S. Kegel</a>, <a href="/search/nucl-ex?searchtype=author&query=Kohl%2C+Y">Y. Kohl</a>, <a href="/search/nucl-ex?searchtype=author&query=Makek%2C+M">M. Makek</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Middleton%2C+D+G">D. G. Middleton</a>, <a href="/search/nucl-ex?searchtype=author&query=Mihovilovi%C4%8D%2C+M">M. Mihovilovi膷</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">U. M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Nungesser%2C+L">L. Nungesser</a>, <a href="/search/nucl-ex?searchtype=author&query=Paolone%2C+M">M. Paolone</a> , et al. (13 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2008.08958v4-abstract-short" style="display: inline;"> Background: Generalized polarizabilities (GPs) are important observables to describe the nucleon structure, and measurements of these observables are still scarce. Purpose: This paper presents details of a virtual Compton scattering (VCS) experiment, performed at the A1 setup at the Mainz Microtron by studying the $e p \to e p 纬$ reaction. The article focuses on selected aspects of the analysis. M… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2008.08958v4-abstract-full').style.display = 'inline'; document.getElementById('2008.08958v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2008.08958v4-abstract-full" style="display: none;"> Background: Generalized polarizabilities (GPs) are important observables to describe the nucleon structure, and measurements of these observables are still scarce. Purpose: This paper presents details of a virtual Compton scattering (VCS) experiment, performed at the A1 setup at the Mainz Microtron by studying the $e p \to e p 纬$ reaction. The article focuses on selected aspects of the analysis. Method: The experiment extracted the $P_{LL} -P_{TT} / 蔚$ and $P_{LT}$ structure functions, as well as the electric and magnetic GPs of the proton, at three new values of the four-momentum transfer squared $Q^2$: 0.10, 0.20 and 0.45 GeV$^2$. Results: We emphasize the importance of the calibration of experimental parameters. The behavior of the measured $e p \to e p 纬$ cross section is presented and compared to the theory. A detailed investigation of the polarizability fits reveals part of their complexity, in connection with the higher-order terms of the low-energy expansion. Conclusions: The presented aspects are elements which contribute to minimize the systematic uncertainties and improve the precision of the physics results. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2008.08958v4-abstract-full').style.display = 'none'; document.getElementById('2008.08958v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 February, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 August, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16 pages, 15 figures, Version 4, regular article to appear in Phys.Rev.C, more final version of some figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 103, 025205 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2008.04209">arXiv:2008.04209</a> <span> [<a href="https://arxiv.org/pdf/2008.04209">pdf</a>, <a href="https://arxiv.org/format/2008.04209">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2020.135984">10.1016/j.physletb.2020.135984 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurements of the induced polarization in the quasi-elastic $A(e,e'\vec p\,)$ process in non-coplanar kinematics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Paul%2C+S+J">Sebouh J. Paul</a>, <a href="/search/nucl-ex?searchtype=author&query=Kolar%2C+T">Tim Kolar</a>, <a href="/search/nucl-ex?searchtype=author&query=Brecelj%2C+T">Tilen Brecelj</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">Patrick Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Arenh%C3%B6vel%2C+H">Hartmuth Arenh枚vel</a>, <a href="/search/nucl-ex?searchtype=author&query=Ashkenazi%2C+A">Adi Ashkenazi</a>, <a href="/search/nucl-ex?searchtype=author&query=Beri%C4%8Di%C4%8D%2C+J">Jure Beri膷i膷</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">Ralph B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">Damir Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=Cline%2C+E">Ethan Cline</a>, <a href="/search/nucl-ex?searchtype=author&query=Cohen%2C+E+O">Erez O. Cohen</a>, <a href="/search/nucl-ex?searchtype=author&query=Debenjak%2C+L">Luka Debenjak</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">Michael O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">Anselm Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Fri%C5%A1%C4%8Di%C4%87%2C+I">Ivica Fri拧膷i膰</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilman%2C+R">Ronald Gilman</a>, <a href="/search/nucl-ex?searchtype=author&query=Giusti%2C+C">Carlotta Giusti</a>, <a href="/search/nucl-ex?searchtype=author&query=Heilig%2C+M">Matthias Heilig</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoek%2C+M">Matthias Hoek</a>, <a href="/search/nucl-ex?searchtype=author&query=Izraeli%2C+D">David Izraeli</a>, <a href="/search/nucl-ex?searchtype=author&query=Kegel%2C+S">Simon Kegel</a>, <a href="/search/nucl-ex?searchtype=author&query=Klag%2C+P">Pascal Klag</a>, <a href="/search/nucl-ex?searchtype=author&query=Kohl%2C+Y">Yvonne Kohl</a>, <a href="/search/nucl-ex?searchtype=author&query=Korover%2C+I">Igor Korover</a>, <a href="/search/nucl-ex?searchtype=author&query=Lichtenstadt%2C+J">Jechiel Lichtenstadt</a> , et al. (22 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2008.04209v2-abstract-short" style="display: inline;"> We report measurements of the induced polarization $\vec P$ of protons knocked out from $^2$H and $^{12}$C via the $A(e,e'\vec p\,)$ reaction. We have studied the dependence of $\vec P$ on two kinematic variables: the missing momentum $p_{\rm miss}$ and the "off-coplanarity" angle $蠁_{pq}$ between the scattering and reaction planes. For the full 360$\degree$ range in $蠁_{pq}$, both the normal (… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2008.04209v2-abstract-full').style.display = 'inline'; document.getElementById('2008.04209v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2008.04209v2-abstract-full" style="display: none;"> We report measurements of the induced polarization $\vec P$ of protons knocked out from $^2$H and $^{12}$C via the $A(e,e'\vec p\,)$ reaction. We have studied the dependence of $\vec P$ on two kinematic variables: the missing momentum $p_{\rm miss}$ and the "off-coplanarity" angle $蠁_{pq}$ between the scattering and reaction planes. For the full 360$\degree$ range in $蠁_{pq}$, both the normal ($P_y$) and, for the first time, the transverse ($P_x$) components of the induced polarization were measured with respect to the coordinate system associated with the scattering plane. $P_x$ vanishes in coplanar kinematics, however in non-coplanar kinematics, it is on the same scale as $P_y$. We find that the dependence on $蠁_{pq}$ is sine-like for $P_x$ and cosine-like for $P_y$. For carbon, the magnitude of the induced polarization is especially large when protons are knocked out from the $p_{3/2}$ shell at very small $p_{\rm miss}$. For the deuteron, the induced polarization is near zero at small $|p_{\rm miss}|$, and its magnitude increases with $|p_{\rm miss}|$. For both nuclei such behavior is reproduced qualitatively by theoretical results, driven largely by the spin-orbit part of the final-state interactions. However, for both nuclei, sizeable discrepancies exist between experiment and theory. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2008.04209v2-abstract-full').style.display = 'none'; document.getElementById('2008.04209v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 August, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 August, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2020. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2007.14985">arXiv:2007.14985</a> <span> [<a href="https://arxiv.org/pdf/2007.14985">pdf</a>, <a href="https://arxiv.org/format/2007.14985">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2020.135903">10.1016/j.physletb.2020.135903 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Comparison of recoil polarization in the $^{12}{\rm C}(\vec{e},{e}'\vec{p})$ process for protons extracted from $s$ and $p$ shell </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Kolar%2C+T">T. Kolar</a>, <a href="/search/nucl-ex?searchtype=author&query=Paul%2C+S">S. Paul</a>, <a href="/search/nucl-ex?searchtype=author&query=Brecelj%2C+T">T. Brecelj</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">R. B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=Cohen%2C+E+O">E. O. Cohen</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Giusti%2C+C">C. Giusti</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoek%2C+M">M. Hoek</a>, <a href="/search/nucl-ex?searchtype=author&query=Izraeli%2C+D">D. Izraeli</a>, <a href="/search/nucl-ex?searchtype=author&query=Kegel%2C+S">S. Kegel</a>, <a href="/search/nucl-ex?searchtype=author&query=Kohl%2C+Y">Y. Kohl</a>, <a href="/search/nucl-ex?searchtype=author&query=Korover%2C+I">I. Korover</a>, <a href="/search/nucl-ex?searchtype=author&query=Lichtenstadt%2C+J">J. Lichtenstadt</a>, <a href="/search/nucl-ex?searchtype=author&query=Mardor%2C+I">I. Mardor</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Mihovilovi%C4%8D%2C+M">M. Mihovilovi膷</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+J">J. M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">U. M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Olivenboim%2C+M">M. Olivenboim</a>, <a href="/search/nucl-ex?searchtype=author&query=Piasetzky%2C+E">E. Piasetzky</a>, <a href="/search/nucl-ex?searchtype=author&query=Pochodzalla%2C+J">J. Pochodzalla</a>, <a href="/search/nucl-ex?searchtype=author&query=Schlimme%2C+B+S">B. S. Schlimme</a> , et al. (7 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2007.14985v2-abstract-short" style="display: inline;"> We present first measurements of the double ratio of the polarization transfer components $(P^{\prime}_{\!x} \!/ P^{\prime}_{\!z} )_p/ (P^{\prime}_{\!x} \!/ P^{\prime}_{\!z} )_s$ for knock-out protons from $s$ and $p$ shells in $^{12}{\rm C}$ measured by the $^{12}{\rm C}(\vec{e},{e}'\vec{p}\,)$ reaction in quasi-elastic kinematics. The data are compared to theoretical predictions in relativistic… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.14985v2-abstract-full').style.display = 'inline'; document.getElementById('2007.14985v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2007.14985v2-abstract-full" style="display: none;"> We present first measurements of the double ratio of the polarization transfer components $(P^{\prime}_{\!x} \!/ P^{\prime}_{\!z} )_p/ (P^{\prime}_{\!x} \!/ P^{\prime}_{\!z} )_s$ for knock-out protons from $s$ and $p$ shells in $^{12}{\rm C}$ measured by the $^{12}{\rm C}(\vec{e},{e}'\vec{p}\,)$ reaction in quasi-elastic kinematics. The data are compared to theoretical predictions in relativistic distorted-wave impulse approximation. Our results show that differences between $s$- and $p$-shell protons, observed when compared at the same initial momentum (missing momentum) largely disappear when the comparison is done at the same proton virtuality. We observe no density-dependent medium modifications for protons from $s$ and $p$ shells with the same virtuality in spite of the large differences in the respective nuclear densities. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.14985v2-abstract-full').style.display = 'none'; document.getElementById('2007.14985v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 July, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2020. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2004.14682">arXiv:2004.14682</a> <span> [<a href="https://arxiv.org/pdf/2004.14682">pdf</a>, <a href="https://arxiv.org/format/2004.14682">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2020.135664">10.1016/j.physletb.2020.135664 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Beam-Normal Single Spin Asymmetry in Elastic Electron Scattering off $^{28}$Si and $^{90}$Zr </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Thiel%2C+M">M. Thiel</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Aulenbacher%2C+K">K. Aulenbacher</a>, <a href="/search/nucl-ex?searchtype=author&query=Aulenbacher%2C+S">S. Aulenbacher</a>, <a href="/search/nucl-ex?searchtype=author&query=Baunack%2C+S">S. Baunack</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=Caiazza%2C+S">S. Caiazza</a>, <a href="/search/nucl-ex?searchtype=author&query=Christmann%2C+M">M. Christmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Dehn%2C+M">M. Dehn</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Doria%2C+L">L. Doria</a>, <a href="/search/nucl-ex?searchtype=author&query=Eckert%2C+P">P. Eckert</a>, <a href="/search/nucl-ex?searchtype=author&query=Gorchtein%2C+M">M. Gorchtein</a>, <a href="/search/nucl-ex?searchtype=author&query=Guelker%2C+P">P. Guelker</a>, <a href="/search/nucl-ex?searchtype=author&query=Herrmann%2C+P">P. Herrmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoek%2C+M">M. Hoek</a>, <a href="/search/nucl-ex?searchtype=author&query=Kegel%2C+S">S. Kegel</a>, <a href="/search/nucl-ex?searchtype=author&query=Klag%2C+P">P. Klag</a>, <a href="/search/nucl-ex?searchtype=author&query=Kreidel%2C+H+-">H. -J. Kreidel</a>, <a href="/search/nucl-ex?searchtype=author&query=Littich%2C+M">M. Littich</a>, <a href="/search/nucl-ex?searchtype=author&query=Lunkenheimer%2C+S">S. Lunkenheimer</a>, <a href="/search/nucl-ex?searchtype=author&query=Maas%2C+F+E">F. E. Maas</a>, <a href="/search/nucl-ex?searchtype=author&query=Makek%2C+M">M. Makek</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a> , et al. (8 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2004.14682v1-abstract-short" style="display: inline;"> We report on a new measurement of the beam-normal single spin asymmetry $A_{\mathrm{n}}$ in the elastic scattering of 570 MeV transversely polarized electrons off $^{28}$Si and $^{90}$Zr at $Q^{2}=0.04\, \mathrm{GeV}^2/c^2$. The studied kinematics allow for a comprehensive comparison with former results on $^{12}$C. No significant mass dependence of the beam-normal single spin asymmetry is observe… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2004.14682v1-abstract-full').style.display = 'inline'; document.getElementById('2004.14682v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2004.14682v1-abstract-full" style="display: none;"> We report on a new measurement of the beam-normal single spin asymmetry $A_{\mathrm{n}}$ in the elastic scattering of 570 MeV transversely polarized electrons off $^{28}$Si and $^{90}$Zr at $Q^{2}=0.04\, \mathrm{GeV}^2/c^2$. The studied kinematics allow for a comprehensive comparison with former results on $^{12}$C. No significant mass dependence of the beam-normal single spin asymmetry is observed in the mass regime from $^{12}$C to $^{90}$Zr. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2004.14682v1-abstract-full').style.display = 'none'; document.getElementById('2004.14682v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 April, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Submitted for publication to Physics Letters B</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2003.00464">arXiv:2003.00464</a> <span> [<a href="https://arxiv.org/pdf/2003.00464">pdf</a>, <a href="https://arxiv.org/format/2003.00464">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.101.064615">10.1103/PhysRevC.101.064615 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Polarization transfer to bound protons measured by quasi-elastic electron scattering on $^{12}$C </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Brecelj%2C+T">Tilen Brecelj</a>, <a href="/search/nucl-ex?searchtype=author&query=Paul%2C+S+J">Sebouh J. Paul</a>, <a href="/search/nucl-ex?searchtype=author&query=Kolar%2C+T">Tim Kolar</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">Patrick Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Ashkenazi%2C+A">Adi Ashkenazi</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">Ralph B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Cohen%2C+E+O">Erez O. Cohen</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">Michael O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">Anselm Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilman%2C+R">Ronald Gilman</a>, <a href="/search/nucl-ex?searchtype=author&query=Giusti%2C+C">Carlotta Giusti</a>, <a href="/search/nucl-ex?searchtype=author&query=Izraeli%2C+D">David Izraeli</a>, <a href="/search/nucl-ex?searchtype=author&query=Korover%2C+I">Igor Korover</a>, <a href="/search/nucl-ex?searchtype=author&query=Lichtenstadt%2C+J">Jechiel Lichtenstadt</a>, <a href="/search/nucl-ex?searchtype=author&query=Mardor%2C+I">Israel Mardor</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">Harald Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Mihovilovi%C4%8D%2C+M">Miha Mihovilovi膷</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">Ulrich M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Olivenboim%2C+M">Mor Olivenboim</a>, <a href="/search/nucl-ex?searchtype=author&query=Piasetzky%2C+E">Eli Piasetzky</a>, <a href="/search/nucl-ex?searchtype=author&query=Ron%2C+G">Guy Ron</a>, <a href="/search/nucl-ex?searchtype=author&query=Schlimme%2C+B+S">Bj枚rn S. Schlimme</a>, <a href="/search/nucl-ex?searchtype=author&query=Schoth%2C+M">Matthias Schoth</a>, <a href="/search/nucl-ex?searchtype=author&query=Schulz%2C+F">Florian Schulz</a>, <a href="/search/nucl-ex?searchtype=author&query=Sfienti%2C+C">Concettina Sfienti</a> , et al. (7 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2003.00464v2-abstract-short" style="display: inline;"> We report the measurements of the transverse ($P'x$) and longitudinal ($P'z$) components of the polarization transfer to a bound proton in carbon via the quasi-free $^{12}{\rm C}(\vec e,e'\vec p)$ reaction, over a wide range of missing momenta. We determine these polarization-transfers separately for protons knocked out from the $s$- and $p$-shells. The electron-beam polarization was measured to d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2003.00464v2-abstract-full').style.display = 'inline'; document.getElementById('2003.00464v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2003.00464v2-abstract-full" style="display: none;"> We report the measurements of the transverse ($P'x$) and longitudinal ($P'z$) components of the polarization transfer to a bound proton in carbon via the quasi-free $^{12}{\rm C}(\vec e,e'\vec p)$ reaction, over a wide range of missing momenta. We determine these polarization-transfers separately for protons knocked out from the $s$- and $p$-shells. The electron-beam polarization was measured to determine the individual components with systematic uncertainties which allow a detailed comparison with theoretical calculations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2003.00464v2-abstract-full').style.display = 'none'; document.getElementById('2003.00464v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 April, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 March, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 101, 064615 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1907.09954">arXiv:1907.09954</a> <span> [<a href="https://arxiv.org/pdf/1907.09954">pdf</a>, <a href="https://arxiv.org/ps/1907.09954">ps</a>, <a href="https://arxiv.org/format/1907.09954">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.123.192302">10.1103/PhysRevLett.123.192302 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> New Insight in the $Q^2$-Dependence of Proton Generalized Polarizabilities </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Beri%C4%8Di%C4%8D%2C+J">J. Beri膷i膷</a>, <a href="/search/nucl-ex?searchtype=author&query=Correa%2C+L">L. Correa</a>, <a href="/search/nucl-ex?searchtype=author&query=Benali%2C+M">M. Benali</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Bernauer%2C+J+C">J. C. Bernauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Blomberg%2C+A">A. Blomberg</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">R. B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=Debenjak%2C+L">L. Debenjak</a>, <a href="/search/nucl-ex?searchtype=author&query=Denig%2C+A">A. Denig</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Downie%2C+E+J">E. J. Downie</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Fonvieille%2C+H">H. Fonvieille</a>, <a href="/search/nucl-ex?searchtype=author&query=Fri%C5%A1%C4%8Di%C4%87%2C+I">I. Fri拧膷i膰</a>, <a href="/search/nucl-ex?searchtype=author&query=Kegel%2C+S">S. Kegel</a>, <a href="/search/nucl-ex?searchtype=author&query=Kohl%2C+Y">Y. Kohl</a>, <a href="/search/nucl-ex?searchtype=author&query=Makek%2C+M">M. Makek</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Middleton%2C+D+G">D. G. Middleton</a>, <a href="/search/nucl-ex?searchtype=author&query=Mihovilovi%C4%8D%2C+M">M. Mihovilovi膷</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">U. M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Nungesser%2C+L">L. Nungesser</a>, <a href="/search/nucl-ex?searchtype=author&query=Paolone%2C+M">M. Paolone</a> , et al. (13 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1907.09954v2-abstract-short" style="display: inline;"> Virtual Compton scattering on the proton has been investigated at three yet unexplored values of the four-momentum transfer $Q^2$: 0.10, 0.20 and 0.45 GeV$^2$, at the Mainz Microtron. Fits performed using either the low-energy theorem or dispersion relations allowed the extraction of the structure functions $P_{LL} -P_{TT} / 蔚$ and $P_{LT}$, as well as the electric and magnetic generalized polariz… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.09954v2-abstract-full').style.display = 'inline'; document.getElementById('1907.09954v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1907.09954v2-abstract-full" style="display: none;"> Virtual Compton scattering on the proton has been investigated at three yet unexplored values of the four-momentum transfer $Q^2$: 0.10, 0.20 and 0.45 GeV$^2$, at the Mainz Microtron. Fits performed using either the low-energy theorem or dispersion relations allowed the extraction of the structure functions $P_{LL} -P_{TT} / 蔚$ and $P_{LT}$, as well as the electric and magnetic generalized polarizabilities $伪_{E1}(Q^2)$ and $尾_{M1}(Q^2)$. These new results show a smooth and rapid fall-off of $伪_{E1}(Q^2)$, in contrast to previous measurements at $Q^2$ = 0.33 GeV$^2$, and provide for the first time a precise mapping of $尾_{M1}(Q^2)$ in the low-$Q^2$ region. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.09954v2-abstract-full').style.display = 'none'; document.getElementById('1907.09954v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 October, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 July, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 1 figure .eps. Version accepted by PRL</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 123, 192302 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1905.11182">arXiv:1905.11182</a> <span> [<a href="https://arxiv.org/pdf/1905.11182">pdf</a>, <a href="https://arxiv.org/format/1905.11182">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> The proton charge radius extracted from the Initial State Radiation experiment at MAMI </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Mihovilovi%C4%8D%2C+M">Miha Mihovilovi膷</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">Patrick Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Beranek%2C+T">Tobias Beranek</a>, <a href="/search/nucl-ex?searchtype=author&query=Beri%C4%8Di%C4%8D%2C+J">Jure Beri膷i膷</a>, <a href="/search/nucl-ex?searchtype=author&query=Bernauer%2C+J+C">Jan C. Bernauer</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">Ralph B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">Damir Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=Cardinali%2C+M">Matteo Cardinali</a>, <a href="/search/nucl-ex?searchtype=author&query=Correa%2C+L">Loup Correa</a>, <a href="/search/nucl-ex?searchtype=author&query=Debenjak%2C+L">Luka Debenjak</a>, <a href="/search/nucl-ex?searchtype=author&query=Denig%2C+A">Achim Denig</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">Michael O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">Anselm Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Bondy%2C+M+I+F">Maria I. Ferretti Bondy</a>, <a href="/search/nucl-ex?searchtype=author&query=Fonvieille%2C+H">Helene Fonvieille</a>, <a href="/search/nucl-ex?searchtype=author&query=Friedrich%2C+J+M">Jan M. Friedrich</a>, <a href="/search/nucl-ex?searchtype=author&query=Fri%C5%A1%C4%8Di%C4%87%2C+I">Ivica Fri拧膷i膰</a>, <a href="/search/nucl-ex?searchtype=author&query=Griffioen%2C+K">Keith Griffioen</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoek%2C+M">Matthias Hoek</a>, <a href="/search/nucl-ex?searchtype=author&query=Kegel%2C+S">Simon Kegel</a>, <a href="/search/nucl-ex?searchtype=author&query=Kohl%2C+Y">Yvonne Kohl</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">Harald Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Middleton%2C+D+G">Duncan G. Middleton</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">Ulrich M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Pochodzalla%2C+J">Josef Pochodzalla</a> , et al. (10 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1905.11182v1-abstract-short" style="display: inline;"> We report on a comprehensive reinterpretation of the existing cross-section data for elastic electron-proton scattering obtained by the initial-state radiation technique, resulting in a significantly improved accuracy of the extracted proton charge radius. By refining the external energy corrections we have achieved an outstanding description of the radiative tail, essential for a detailed investi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.11182v1-abstract-full').style.display = 'inline'; document.getElementById('1905.11182v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1905.11182v1-abstract-full" style="display: none;"> We report on a comprehensive reinterpretation of the existing cross-section data for elastic electron-proton scattering obtained by the initial-state radiation technique, resulting in a significantly improved accuracy of the extracted proton charge radius. By refining the external energy corrections we have achieved an outstanding description of the radiative tail, essential for a detailed investigation of the proton finite-size effects on the measured cross-sections. This development, together with a novel framework for determining the radius, based on a regression analysis of the cross-sections employing a polynomial model for the form factor, led us to a new value for the charge radius, which is $(0.870 \pm 0.014_\mathrm{stat.}\pm 0.024_\mathrm{sys.} \pm 0.003_\mathrm{mod.})\,\mathrm{fm}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.11182v1-abstract-full').style.display = 'none'; document.getElementById('1905.11182v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1901.10958">arXiv:1901.10958</a> <span> [<a href="https://arxiv.org/pdf/1901.10958">pdf</a>, <a href="https://arxiv.org/format/1901.10958">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2019.04.004">10.1016/j.physletb.2019.04.004 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The influence of Fermi motion on the comparison of the polarization transfer to a proton in elastic $\vec ep$ and quasi-elastic $\vec eA$ scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Paul%2C+S">S. Paul</a>, <a href="/search/nucl-ex?searchtype=author&query=Brecelj%2C+T">T. Brecelj</a>, <a href="/search/nucl-ex?searchtype=author&query=Arenh%C3%B6vel%2C+H">H. Arenh枚vel</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Ashkenazi%2C+A">A. Ashkenazi</a>, <a href="/search/nucl-ex?searchtype=author&query=Beri%C4%8Di%C4%8D%2C+J">J. Beri膷i膷</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">R. B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=Cohen%2C+E+O">E. O. Cohen</a>, <a href="/search/nucl-ex?searchtype=author&query=Debenjak%2C+L">L. Debenjak</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Fri%C5%A1%C4%8Di%C4%87%2C+I">I. Fri拧膷i膰</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilman%2C+R">R. Gilman</a>, <a href="/search/nucl-ex?searchtype=author&query=Izraeli%2C+D">D. Izraeli</a>, <a href="/search/nucl-ex?searchtype=author&query=Kolar%2C+T">T. Kolar</a>, <a href="/search/nucl-ex?searchtype=author&query=Korover%2C+I">I. Korover</a>, <a href="/search/nucl-ex?searchtype=author&query=Lichtenstadt%2C+J">J. Lichtenstadt</a>, <a href="/search/nucl-ex?searchtype=author&query=Mardor%2C+I">I. Mardor</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Middleton%2C+D+G">D. G. Middleton</a>, <a href="/search/nucl-ex?searchtype=author&query=Mihovilovi%C4%8D%2C+M">M. Mihovilovi膷</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">U. M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Olivenboim%2C+M">M. Olivenboim</a>, <a href="/search/nucl-ex?searchtype=author&query=Piasetzky%2C+E">E. Piasetzky</a> , et al. (13 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1901.10958v3-abstract-short" style="display: inline;"> A comparison between polarization-transfer to a bound proton in quasi-free kinematics by the A$(\vec{e},e'\vec p)$ knockout reaction and that in elastic scattering off a free proton can provide information on the characteristics of the bound proton. In the past the reported measurements have been compared to those of a free proton with zero initial momentum. We introduce, for the first time, expre… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.10958v3-abstract-full').style.display = 'inline'; document.getElementById('1901.10958v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1901.10958v3-abstract-full" style="display: none;"> A comparison between polarization-transfer to a bound proton in quasi-free kinematics by the A$(\vec{e},e'\vec p)$ knockout reaction and that in elastic scattering off a free proton can provide information on the characteristics of the bound proton. In the past the reported measurements have been compared to those of a free proton with zero initial momentum. We introduce, for the first time, expressions for the polarization-transfer components when the proton is initially in motion and compare them to the $^2$H data measured at the Mainz Microtron (MAMI). We show the ratios of the transverse ($P_x$) and longitudinal ($P_z$) components of the polarization transfer in $^2\textrm{H}(\vec{e},e'\vec p)\textrm{n}$, to those of elastic scattering off a "moving proton", assuming the proton's initial (Fermi) momentum equals the negative missing momentum in the measured reaction. We found that the correction due to the proton motion is up to 20\% at high missing momentum. However the effect on the double ratio $\frac{(P_x/P_z)^A}{(P_x/P_z)^{^1\!\textrm{H}}}$ is largely canceled out, as shown for both $^2$H and $^{12}$C data. This implies that the kinematics is not the primary cause for the deviations between quasi-elastic and elastic scattering reported previously. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.10958v3-abstract-full').style.display = 'none'; document.getElementById('1901.10958v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 April, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 January, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physics Letters B 792 (2019) 445-449 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1901.08951">arXiv:1901.08951</a> <span> [<a href="https://arxiv.org/pdf/1901.08951">pdf</a>, <a href="https://arxiv.org/ps/1901.08951">ps</a>, <a href="https://arxiv.org/format/1901.08951">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epja/i2019-12877-0">10.1140/epja/i2019-12877-0 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Virtual Compton Scattering measurements in the nucleon resonance region </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Blomberg%2C+A">A. Blomberg</a>, <a href="/search/nucl-ex?searchtype=author&query=Atac%2C+H">H. Atac</a>, <a href="/search/nucl-ex?searchtype=author&query=Sparveris%2C+N">N. Sparveris</a>, <a href="/search/nucl-ex?searchtype=author&query=Paolone%2C+M">M. Paolone</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Benali%2C+M">M. Benali</a>, <a href="/search/nucl-ex?searchtype=author&query=Beri%C4%8Di%C4%8D%2C+J">J. Beri膷i膷</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">R. B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Correa%2C+L">L. Correa</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Flay%2C+D">D. Flay</a>, <a href="/search/nucl-ex?searchtype=author&query=Fonvieille%2C+H">H. Fonvieille</a>, <a href="/search/nucl-ex?searchtype=author&query=Fri%C5%A1%C4%8Di%C4%87%2C+I">I. Fri拧膷i膰</a>, <a href="/search/nucl-ex?searchtype=author&query=Kohl%2C+Y">Y. Kohl</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">U. M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Meziani%2C+Z+E">Z. E. Meziani</a>, <a href="/search/nucl-ex?searchtype=author&query=Mihovilovic%2C+M">M. Mihovilovic</a>, <a href="/search/nucl-ex?searchtype=author&query=Pochodzalla%2C+J">J. Pochodzalla</a>, <a href="/search/nucl-ex?searchtype=author&query=Polychronopoulou%2C+A">A. Polychronopoulou</a>, <a href="/search/nucl-ex?searchtype=author&query=Pasquini%2C+B">B. Pasquini</a>, <a href="/search/nucl-ex?searchtype=author&query=Schoth%2C+M">M. Schoth</a>, <a href="/search/nucl-ex?searchtype=author&query=Schulz%2C+F">F. Schulz</a>, <a href="/search/nucl-ex?searchtype=author&query=Schlimme%2C+S">S. Schlimme</a> , et al. (3 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1901.08951v2-abstract-short" style="display: inline;"> We report on new measurements of the electric Generalized Polarizability (GP) of the proton $伪_E$ in a kinematic region where a puzzling dependence on momentum transfer has been observed, and we have found that $伪_E = (5.3 \pm 0.6_{stat} \pm 1.3_{sys})~10^{-4} fm^3$ at $Q^2=0.20~(GeV/c)^2$. The new measurements, when considered along with the rest of the world data, suggest that $伪_E$ can be descr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.08951v2-abstract-full').style.display = 'inline'; document.getElementById('1901.08951v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1901.08951v2-abstract-full" style="display: none;"> We report on new measurements of the electric Generalized Polarizability (GP) of the proton $伪_E$ in a kinematic region where a puzzling dependence on momentum transfer has been observed, and we have found that $伪_E = (5.3 \pm 0.6_{stat} \pm 1.3_{sys})~10^{-4} fm^3$ at $Q^2=0.20~(GeV/c)^2$. The new measurements, when considered along with the rest of the world data, suggest that $伪_E$ can be described by either a local plateau or by an enhancement in the region $Q^2=0.20~(GeV/c)^2$ to $0.33~(GeV/c)^2$. The experiment also provides the first measurement of the Coulomb quadrupole amplitude in the $N \rightarrow 螖$ transition through the exploration of the $p(e,e'p)纬$ reaction. The new measurement gives $CMR = (-4.4 \pm 0.8_{stat} \pm 0.6_{sys})~\%$ at $Q^2=0.20~(GeV/c)^2$ and is consistent with the results from the pion electroproduction world data. It has been obtained using a completely different extraction method, and therefore represents a strong validation test of the world data model uncertainties. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.08951v2-abstract-full').style.display = 'none'; document.getElementById('1901.08951v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 February, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 January, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1801.01306">arXiv:1801.01306</a> <span> [<a href="https://arxiv.org/pdf/1801.01306">pdf</a>, <a href="https://arxiv.org/format/1801.01306">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2018.03.063">10.1016/j.physletb.2018.03.063 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Components of polarization-transfer to a bound proton in a deuteron measured by quasi-elastic electron scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=A1+Collaboration"> A1 Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Izraeli%2C+D">D. Izraeli</a>, <a href="/search/nucl-ex?searchtype=author&query=Yaron%2C+I">I. Yaron</a>, <a href="/search/nucl-ex?searchtype=author&query=Schlimme%2C+B+S">B. S. Schlimme</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Arenh%C3%B6vel%2C+H">H. Arenh枚vel</a>, <a href="/search/nucl-ex?searchtype=author&query=Ashkenazi%2C+A">A. Ashkenazi</a>, <a href="/search/nucl-ex?searchtype=author&query=Beri%C4%8Di%C4%8D%2C+J">J. Beri膷i膷</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">R. B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=Cohen%2C+E+O">E. O. Cohen</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Fri%C5%A1%C4%8Di%C4%87%2C+I">I. Fri拧膷i膰</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilman%2C+R">R. Gilman</a>, <a href="/search/nucl-ex?searchtype=author&query=Korover%2C+I">I. Korover</a>, <a href="/search/nucl-ex?searchtype=author&query=Lichtenstadt%2C+J">J. Lichtenstadt</a>, <a href="/search/nucl-ex?searchtype=author&query=Mardor%2C+I">I. Mardor</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Middleton%2C+D+G">D. G. Middleton</a>, <a href="/search/nucl-ex?searchtype=author&query=Mihovilovi%C4%8D%2C+M">M. Mihovilovi膷</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">U. M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Olievenboim%2C+M">M. Olievenboim</a>, <a href="/search/nucl-ex?searchtype=author&query=Piasetzky%2C+E">E. Piasetzky</a>, <a href="/search/nucl-ex?searchtype=author&query=Pochodzalla%2C+J">J. Pochodzalla</a> , et al. (11 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1801.01306v2-abstract-short" style="display: inline;"> We report the first measurements of the transverse ($P_{x}$ and $P_{y}$) and longitudinal ($P_{z}$) components of the polarization transfer to a bound proton in the deuteron via the $^{2}\mathrm{H}(\vec{e},e'\vec{p})$ reaction, over a wide range of missing momentum. A precise determination of the electron beam polarization reduces the systematic uncertainties on the individual components, to a lev… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1801.01306v2-abstract-full').style.display = 'inline'; document.getElementById('1801.01306v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1801.01306v2-abstract-full" style="display: none;"> We report the first measurements of the transverse ($P_{x}$ and $P_{y}$) and longitudinal ($P_{z}$) components of the polarization transfer to a bound proton in the deuteron via the $^{2}\mathrm{H}(\vec{e},e'\vec{p})$ reaction, over a wide range of missing momentum. A precise determination of the electron beam polarization reduces the systematic uncertainties on the individual components, to a level that enables a detailed comparison to a state-of-the-art calculation of the deuteron that uses free-proton electromagnetic form factors. We observe very good agreement between the measured and the calculated $P_{x}/P_{z}$ ratios, but deviations of the individual components. Our results cannot be explained by medium modified electromagnetic form factors. They point to an incomplete description of the nuclear reaction mechanism in the calculation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1801.01306v2-abstract-full').style.display = 'none'; document.getElementById('1801.01306v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 January, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 January, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2018. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1711.09680">arXiv:1711.09680</a> <span> [<a href="https://arxiv.org/pdf/1711.09680">pdf</a>, <a href="https://arxiv.org/format/1711.09680">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2018.03.027">10.1016/j.physletb.2018.03.027 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of polarization-transfer to bound protons in carbon and its virtuality dependence </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=A1+Collaboration"> A1 Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Izraeli%2C+D">D. Izraeli</a>, <a href="/search/nucl-ex?searchtype=author&query=Brecelj%2C+T">T. Brecelj</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Ashkenazi%2C+A">A. Ashkenazi</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">R. B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Cohen%2C+E+O">E. O. Cohen</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilman%2C+R">R. Gilman</a>, <a href="/search/nucl-ex?searchtype=author&query=Kolar%2C+T">T. Kolar</a>, <a href="/search/nucl-ex?searchtype=author&query=Korover%2C+I">I. Korover</a>, <a href="/search/nucl-ex?searchtype=author&query=Lichtenstadt%2C+J">J. Lichtenstadt</a>, <a href="/search/nucl-ex?searchtype=author&query=Mardor%2C+I">I. Mardor</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Mihovilovi%C4%8D%2C+M">M. Mihovilovi膷</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">U. M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Olivenboim%2C+M">M. Olivenboim</a>, <a href="/search/nucl-ex?searchtype=author&query=Piasetzky%2C+E">E. Piasetzky</a>, <a href="/search/nucl-ex?searchtype=author&query=Ron%2C+G">G. Ron</a>, <a href="/search/nucl-ex?searchtype=author&query=Schlimme%2C+B+S">B. S. Schlimme</a>, <a href="/search/nucl-ex?searchtype=author&query=Schoth%2C+M">M. Schoth</a>, <a href="/search/nucl-ex?searchtype=author&query=Sfienti%2C+C">C. Sfienti</a>, <a href="/search/nucl-ex?searchtype=author&query=%C5%A0irca%2C+S">S. 艩irca</a>, <a href="/search/nucl-ex?searchtype=author&query=%C5%A0tajner%2C+S">S. 艩tajner</a> , et al. (4 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1711.09680v2-abstract-short" style="display: inline;"> We measured the ratio $P_{x}/P_{z}$ of the transverse to longitudinal components of polarization transferred from electrons to bound protons in $^{12}\mathrm{C}$ by the $^{12}\mathrm{C}(\vec{e},e'\vec{p})$ process at the Mainz Microtron (MAMI). We observed consistent deviations from unity of this ratio normalized to the free-proton ratio,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.09680v2-abstract-full').style.display = 'inline'; document.getElementById('1711.09680v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1711.09680v2-abstract-full" style="display: none;"> We measured the ratio $P_{x}/P_{z}$ of the transverse to longitudinal components of polarization transferred from electrons to bound protons in $^{12}\mathrm{C}$ by the $^{12}\mathrm{C}(\vec{e},e'\vec{p})$ process at the Mainz Microtron (MAMI). We observed consistent deviations from unity of this ratio normalized to the free-proton ratio, $(P_{x}/P_{z})_{^{12}\mathrm{C}}/(P_{x}/P_{z})_{^{1}\mathrm{H}}$, for both $s$- and $p$-shell knocked out protons, even though they are embedded in averaged local densities that differ by about a factor of two. The dependence of the double ratio on proton virtuality is similar to the one for knocked out protons from $^{2}\mathrm{H}$ and $^{4}\mathrm{He}$, suggesting a universal behavior. It further implies no dependence on average local nuclear density. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.09680v2-abstract-full').style.display = 'none'; document.getElementById('1711.09680v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 February, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 November, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2017. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1612.06707">arXiv:1612.06707</a> <span> [<a href="https://arxiv.org/pdf/1612.06707">pdf</a>, <a href="https://arxiv.org/format/1612.06707">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2017.05.031">10.1016/j.physletb.2017.05.031 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First measurement of proton's charge form factor at very low $Q^2$ with initial state radiation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Mihovilovi%C4%8D%2C+M">M. Mihovilovi膷</a>, <a href="/search/nucl-ex?searchtype=author&query=Weber%2C+A+B">A. B. Weber</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Beranek%2C+T">T. Beranek</a>, <a href="/search/nucl-ex?searchtype=author&query=Beri%C4%8Di%C4%8D%2C+J">J. Beri膷i膷</a>, <a href="/search/nucl-ex?searchtype=author&query=Bernauer%2C+J+C">J. C. Bernauer</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">R. B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=Cardinali%2C+M">M. Cardinali</a>, <a href="/search/nucl-ex?searchtype=author&query=Correa%2C+L">L. Correa</a>, <a href="/search/nucl-ex?searchtype=author&query=Debenjak%2C+L">L. Debenjak</a>, <a href="/search/nucl-ex?searchtype=author&query=Denig%2C+A">A. Denig</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Bondy%2C+M+I+F">M. I. Ferretti Bondy</a>, <a href="/search/nucl-ex?searchtype=author&query=Fonvieille%2C+H">H. Fonvieille</a>, <a href="/search/nucl-ex?searchtype=author&query=Friedrich%2C+J+M">J. M. Friedrich</a>, <a href="/search/nucl-ex?searchtype=author&query=Fri%C5%A1%C4%8Di%C4%87%2C+I">I. Fri拧膷i膰</a>, <a href="/search/nucl-ex?searchtype=author&query=Griffioen%2C+K">K. Griffioen</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoek%2C+M">M. Hoek</a>, <a href="/search/nucl-ex?searchtype=author&query=Kegel%2C+S">S. Kegel</a>, <a href="/search/nucl-ex?searchtype=author&query=Kohl%2C+Y">Y. Kohl</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Middleton%2C+D+G">D. G. Middleton</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">U. M眉ller</a> , et al. (14 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1612.06707v1-abstract-short" style="display: inline;"> We report on a new experimental method based on initial-state radiation (ISR) in e-p scattering, in which the radiative tail of the elastic e-p peak contains information on the proton charge form factor ($G_E^p$) at extremely small $Q^2$. The ISR technique was validated in a dedicated experiment using the spectrometers of the A1-Collaboration at the Mainz Microtron (MAMI). This provided first meas… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1612.06707v1-abstract-full').style.display = 'inline'; document.getElementById('1612.06707v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1612.06707v1-abstract-full" style="display: none;"> We report on a new experimental method based on initial-state radiation (ISR) in e-p scattering, in which the radiative tail of the elastic e-p peak contains information on the proton charge form factor ($G_E^p$) at extremely small $Q^2$. The ISR technique was validated in a dedicated experiment using the spectrometers of the A1-Collaboration at the Mainz Microtron (MAMI). This provided first measurements of $G_E^p$ for $0.001\leq Q^2\leq 0.004 (GeV/c)^2$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1612.06707v1-abstract-full').style.display = 'none'; document.getElementById('1612.06707v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 December, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 3 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1606.00970">arXiv:1606.00970</a> <span> [<a href="https://arxiv.org/pdf/1606.00970">pdf</a>, <a href="https://arxiv.org/ps/1606.00970">ps</a>, <a href="https://arxiv.org/format/1606.00970">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2017.01.033">10.1016/j.physletb.2017.01.033 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the $p(e,e'蟺^+)n$ reaction close to threshold and at low $Q^2$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=A1+Collaboration"> A1 Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Fri%C5%A1%C4%8Di%C4%87%2C+I">I. Fri拧膷i膰</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Baumann%2C+D">D. Baumann</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">R. B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=Debenjak%2C+L">L. Debenjak</a>, <a href="/search/nucl-ex?searchtype=author&query=Denig%2C+A">A. Denig</a>, <a href="/search/nucl-ex?searchtype=author&query=Ding%2C+M">M. Ding</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Middleton%2C+D+G">D. G. Middleton</a>, <a href="/search/nucl-ex?searchtype=author&query=Mihovilovi%C4%8D%2C+M">M. Mihovilovi膷</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">U. M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Pochodzalla%2C+J">J. Pochodzalla</a>, <a href="/search/nucl-ex?searchtype=author&query=Schlimme%2C+B+S">B. S. Schlimme</a>, <a href="/search/nucl-ex?searchtype=author&query=Schoth%2C+M">M. Schoth</a>, <a href="/search/nucl-ex?searchtype=author&query=Schulz%2C+F">F. Schulz</a>, <a href="/search/nucl-ex?searchtype=author&query=Sfienti%2C+C">C. Sfienti</a>, <a href="/search/nucl-ex?searchtype=author&query=%C5%A0irca%2C+S">S. 艩irca</a>, <a href="/search/nucl-ex?searchtype=author&query=Thiel%2C+M">M. Thiel</a>, <a href="/search/nucl-ex?searchtype=author&query=Walcher%2C+T">Th. Walcher</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1606.00970v3-abstract-short" style="display: inline;"> The cross section of the $p(e,e'蟺^+)n$ reaction has been measured for five kinematic settings at an invariant mass of $W = 1094$ MeV and for a four-momentum transfer of $Q^2 = 0.078$ (GeV/$c$)$^2$. The measurement has been performed at MAMI using a new short-orbit spectrometer (SOS) of the A1 collaboration, intended for detection of low-energy pions. The transverse and longitudinal cross section t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1606.00970v3-abstract-full').style.display = 'inline'; document.getElementById('1606.00970v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1606.00970v3-abstract-full" style="display: none;"> The cross section of the $p(e,e'蟺^+)n$ reaction has been measured for five kinematic settings at an invariant mass of $W = 1094$ MeV and for a four-momentum transfer of $Q^2 = 0.078$ (GeV/$c$)$^2$. The measurement has been performed at MAMI using a new short-orbit spectrometer (SOS) of the A1 collaboration, intended for detection of low-energy pions. The transverse and longitudinal cross section terms were separated using the Rosenbluth method and the transverse-longitudinal interference term has been determined from the left-right asymmetry. The experimental cross section terms are compared with the calculations of three models: DMT2001, MAID2007 and $蠂$MAID. The results show that we do not yet understand the dynamics of the fundamental pion. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1606.00970v3-abstract-full').style.display = 'none'; document.getElementById('1606.00970v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 January, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 3 June, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">version accepted for publishing</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Lett. B 766 (2017) 301-305 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1602.06104">arXiv:1602.06104</a> <span> [<a href="https://arxiv.org/pdf/1602.06104">pdf</a>, <a href="https://arxiv.org/format/1602.06104">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Polarization-transfer measurement to a large-virtuality bound proton in the deuteron </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=A1+Collaboration"> A1 Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Yaron%2C+I">I. Yaron</a>, <a href="/search/nucl-ex?searchtype=author&query=Izraeli%2C+D">D. Izraeli</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Arenh%C3%B6vel%2C+H">H. Arenh枚vel</a>, <a href="/search/nucl-ex?searchtype=author&query=Beri%C4%8Di%C4%8D%2C+J">J. Beri膷i膷</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">R. B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=Debenjak%2C+L">L. Debenjak</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Fri%C5%A1%C4%8Di%C4%87%2C+I">I. Fri拧膷i膰</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilman%2C+R">R. Gilman</a>, <a href="/search/nucl-ex?searchtype=author&query=Korover%2C+I">I. Korover</a>, <a href="/search/nucl-ex?searchtype=author&query=Lichtenstadt%2C+J">J. Lichtenstadt</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Middleton%2C+D+G">D. G. Middleton</a>, <a href="/search/nucl-ex?searchtype=author&query=Mihovilovi%C4%8D%2C+M">M. Mihovilovi膷</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">U. M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Piasetzky%2C+E">E. Piasetzky</a>, <a href="/search/nucl-ex?searchtype=author&query=%C5%A0irca%2C+S">S. 艩irca</a>, <a href="/search/nucl-ex?searchtype=author&query=Strauch%2C+S">S. Strauch</a>, <a href="/search/nucl-ex?searchtype=author&query=Pochodzalla%2C+J">J. Pochodzalla</a>, <a href="/search/nucl-ex?searchtype=author&query=Ron%2C+G">G. Ron</a>, <a href="/search/nucl-ex?searchtype=author&query=Schlimme%2C+B+S">B. S. Schlimme</a> , et al. (6 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1602.06104v1-abstract-short" style="display: inline;"> Possible differences between free and bound protons may be observed in the ratio of polarization-transfer components, $P'_x/P'_z$. We report the measurement of $P'_x/P'_z$, in the $^2\textrm{H}(\vec{e},e^{\prime}\vec{p})n$ reaction at low and high missing momenta. Observed increasing deviation of $P'_x/P'_z$ from that of a free proton as a function of the virtuality, similar to that observed in \h… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1602.06104v1-abstract-full').style.display = 'inline'; document.getElementById('1602.06104v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1602.06104v1-abstract-full" style="display: none;"> Possible differences between free and bound protons may be observed in the ratio of polarization-transfer components, $P'_x/P'_z$. We report the measurement of $P'_x/P'_z$, in the $^2\textrm{H}(\vec{e},e^{\prime}\vec{p})n$ reaction at low and high missing momenta. Observed increasing deviation of $P'_x/P'_z$ from that of a free proton as a function of the virtuality, similar to that observed in \hefour, indicates that the effect in nuclei is due to the virtuality of the knock-out proton and not due to the average nuclear density. The measured differences from calculations assuming free-proton form factors ($\sim10\%$), may indicate in-medium modifications. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1602.06104v1-abstract-full').style.display = 'none'; document.getElementById('1602.06104v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 February, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1501.06823">arXiv:1501.06823</a> <span> [<a href="https://arxiv.org/pdf/1501.06823">pdf</a>, <a href="https://arxiv.org/format/1501.06823">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.114.232501">10.1103/PhysRevLett.114.232501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Observation of Lambda H-4 hyperhydrogen by decay-pion spectroscopy in electron scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Nagao%2C+S">S. Nagao</a>, <a href="/search/nucl-ex?searchtype=author&query=Schulz%2C+F">F. Schulz</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">R. B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Borodina%2C+O">O. Borodina</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bozkurt%2C+V">V. Bozkurt</a>, <a href="/search/nucl-ex?searchtype=author&query=Debenjak%2C+L">L. Debenjak</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Fri%C5%A1%C4%8Di%C4%87%2C+I">I. Fri拧膷i膰</a>, <a href="/search/nucl-ex?searchtype=author&query=Fujii%2C+Y">Y. Fujii</a>, <a href="/search/nucl-ex?searchtype=author&query=Gogami%2C+T">T. Gogami</a>, <a href="/search/nucl-ex?searchtype=author&query=Hashimoto%2C+O">O. Hashimoto</a>, <a href="/search/nucl-ex?searchtype=author&query=Hirose%2C+S">S. Hirose</a>, <a href="/search/nucl-ex?searchtype=author&query=Kanda%2C+H">H. Kanda</a>, <a href="/search/nucl-ex?searchtype=author&query=Kaneta%2C+M">M. Kaneta</a>, <a href="/search/nucl-ex?searchtype=author&query=Kim%2C+E">E. Kim</a>, <a href="/search/nucl-ex?searchtype=author&query=Kohl%2C+Y">Y. Kohl</a>, <a href="/search/nucl-ex?searchtype=author&query=Kusaka%2C+J">J. Kusaka</a>, <a href="/search/nucl-ex?searchtype=author&query=Margaryan%2C+A">A. Margaryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Mihovilovi%C4%8D%2C+M">M. Mihovilovi膷</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">U. M眉ller</a> , et al. (16 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1501.06823v2-abstract-short" style="display: inline;"> At the Mainz Microtron MAMI, the first high-resolution pion spectroscopy from decays of strange systems was performed by electron scattering off a Be-9 target in order to study the ground-state masses of Lambda-hypernuclei. Positively charged kaons were detected by a short-orbit spectrometer with a broad momentum acceptance at zero degree forward angles with respect to the beam, efficiently taggin… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.06823v2-abstract-full').style.display = 'inline'; document.getElementById('1501.06823v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1501.06823v2-abstract-full" style="display: none;"> At the Mainz Microtron MAMI, the first high-resolution pion spectroscopy from decays of strange systems was performed by electron scattering off a Be-9 target in order to study the ground-state masses of Lambda-hypernuclei. Positively charged kaons were detected by a short-orbit spectrometer with a broad momentum acceptance at zero degree forward angles with respect to the beam, efficiently tagging the production of strangeness in the target nucleus. In coincidence, negatively charged decay-pions were detected by two independent high-resolution spectrometers. About 10^3 pionic weak decays of hyperfragments and hyperons were observed. The pion momentum distribution shows a monochromatic peak at p_pi ~ 133 MeV/c, corresponding to the unique signature for the two-body decay of hyperhydrogen Lambda H-4 -> He-4 + pi-, stopped inside the target. Its binding energy was determined to be B_Lambda = 2.12 +- 0.01 (stat.) +- 0.09 (syst.) MeV with respect to the H-3 + Lambda mass. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.06823v2-abstract-full').style.display = 'none'; document.getElementById('1501.06823v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 May, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 January, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 114, 232501 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1404.5502">arXiv:1404.5502</a> <span> [<a href="https://arxiv.org/pdf/1404.5502">pdf</a>, <a href="https://arxiv.org/format/1404.5502">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.112.221802">10.1103/PhysRevLett.112.221802 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for light massive gauge bosons as an explanation of the $(g-2)_渭$ anomaly at MAMI </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Beranek%2C+T">T. Beranek</a>, <a href="/search/nucl-ex?searchtype=author&query=Beri%C4%8Di%C4%8D%2C+J">J. Beri膷i膷</a>, <a href="/search/nucl-ex?searchtype=author&query=Bernauer%2C+J+C">J. C. Bernauer</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">R. B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=Correa%2C+L">L. Correa</a>, <a href="/search/nucl-ex?searchtype=author&query=Debenjak%2C+L">L. Debenjak</a>, <a href="/search/nucl-ex?searchtype=author&query=Denig%2C+A">A. Denig</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Fonvieille%2C+H">H. Fonvieille</a>, <a href="/search/nucl-ex?searchtype=author&query=Fri%C5%A1%C4%8Di%C4%87%2C+I">I. Fri拧膷i膰</a>, <a href="/search/nucl-ex?searchtype=author&query=de+la+Paz%2C+M+G+R">M. G贸mez Rodr铆guez de la Paz</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoek%2C+M">M. Hoek</a>, <a href="/search/nucl-ex?searchtype=author&query=Kegel%2C+S">S. Kegel</a>, <a href="/search/nucl-ex?searchtype=author&query=Kohl%2C+Y">Y. Kohl</a>, <a href="/search/nucl-ex?searchtype=author&query=Middleton%2C+D+G">D. G. Middleton</a>, <a href="/search/nucl-ex?searchtype=author&query=Mihovilovi%C4%8D%2C+M">M. Mihovilovi膷</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">U. M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Nungesser%2C+L">L. Nungesser</a>, <a href="/search/nucl-ex?searchtype=author&query=Pochodzalla%2C+J">J. Pochodzalla</a>, <a href="/search/nucl-ex?searchtype=author&query=Rohrbeck%2C+M">M. Rohrbeck</a> , et al. (11 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1404.5502v1-abstract-short" style="display: inline;"> A massive, but light abelian U(1) gauge boson is a well motivated possible signature of physics beyond the Standard Model of particle physics. In this paper, the search for the signal of such a U(1) gauge boson in electron-positron pair-production at the spectrometer setup of the A1 Collaboration at the Mainz Microtron (MAMI) is described. Exclusion limits in the mass range of 40 MeV up to 300 MeV… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1404.5502v1-abstract-full').style.display = 'inline'; document.getElementById('1404.5502v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1404.5502v1-abstract-full" style="display: none;"> A massive, but light abelian U(1) gauge boson is a well motivated possible signature of physics beyond the Standard Model of particle physics. In this paper, the search for the signal of such a U(1) gauge boson in electron-positron pair-production at the spectrometer setup of the A1 Collaboration at the Mainz Microtron (MAMI) is described. Exclusion limits in the mass range of 40 MeV up to 300 MeV with a sensitivity in the mixing parameter of down to $蔚^2 = 8\times 10^{-7}$ are presented. A large fraction of the parameter space has been excluded where the discrepancy of the measured anomalous magnetic moment of the muon with theory might be explained by an additional U(1) gauge boson. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1404.5502v1-abstract-full').style.display = 'none'; document.getElementById('1404.5502v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 April, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 112 (2014), 221802 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1307.6227">arXiv:1307.6227</a> <span> [<a href="https://arxiv.org/pdf/1307.6227">pdf</a>, <a href="https://arxiv.org/format/1307.6227">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.90.015206">10.1103/PhysRevC.90.015206 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The electric and magnetic form factors of the proton </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=A1+Collaboration"> A1 Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Bernauer%2C+J+C">J. C. Bernauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Friedrich%2C+J">J. Friedrich</a>, <a href="/search/nucl-ex?searchtype=author&query=Walcher%2C+T">Th. Walcher</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+P+A+C+A">P. Achenbach C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">R. B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Debenjak%2C+L">L. Debenjak</a>, <a href="/search/nucl-ex?searchtype=author&query=Doria%2C+L">L. Doria</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Fonvieille%2C+H">H. Fonvieille</a>, <a href="/search/nucl-ex?searchtype=author&query=de+la+Paz%2C+M+G+R">M. G贸mez Rodr铆gues de la Paz</a>, <a href="/search/nucl-ex?searchtype=author&query=Friedrich%2C+J+M">J. M. Friedrich</a>, <a href="/search/nucl-ex?searchtype=author&query=Makek%2C+M">M. Makek</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Middleton%2C+D+G">D. G. Middleton</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">U. M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Nungesser%2C+L">L. Nungesser</a>, <a href="/search/nucl-ex?searchtype=author&query=Pochodzalla%2C+J">J. Pochodzalla</a>, <a href="/search/nucl-ex?searchtype=author&query=Potokar%2C+M">M. Potokar</a>, <a href="/search/nucl-ex?searchtype=author&query=Majos%2C+S+S">S. S谩nchez Majos</a>, <a href="/search/nucl-ex?searchtype=author&query=Schlimme%2C+B+S">B. S. Schlimme</a>, <a href="/search/nucl-ex?searchtype=author&query=%C5%A0irca%2C+S">S. 艩irca</a>, <a href="/search/nucl-ex?searchtype=author&query=Weinriefer%2C+M">M. Weinriefer</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1307.6227v2-abstract-short" style="display: inline;"> The paper describes a precise measurement of electron scattering off the proton at momentum transfers of $0.003 \lesssim Q^2 \lesssim 1$\ GeV$^2$. The average point-to-point error of the cross sections in this experiment is $\sim$ 0.37%. These data are used for a coherent new analysis together with all world data of unpolarized and polarized electron scattering from the very smallest to the highes… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1307.6227v2-abstract-full').style.display = 'inline'; document.getElementById('1307.6227v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1307.6227v2-abstract-full" style="display: none;"> The paper describes a precise measurement of electron scattering off the proton at momentum transfers of $0.003 \lesssim Q^2 \lesssim 1$\ GeV$^2$. The average point-to-point error of the cross sections in this experiment is $\sim$ 0.37%. These data are used for a coherent new analysis together with all world data of unpolarized and polarized electron scattering from the very smallest to the highest momentum transfers so far measured. The extracted electric and magnetic form factors provide new insight into their exact shape, deviating from the classical dipole form, and of structure on top of this gross shape. The data reaching very low $Q^2$ values are used for a new determination of the electric and magnetic radii. An empirical determination of the Two-Photon-Exchange (TPE) correction is presented. The implications of this correction on the radii and the question of a directly visible signal of the pion cloud are addressed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1307.6227v2-abstract-full').style.display = 'none'; document.getElementById('1307.6227v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 July, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 July, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">38 pages, 20 figures. Updated data files. PRC version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 90, 015206 (2014) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1108.3533">arXiv:1108.3533</a> <span> [<a href="https://arxiv.org/pdf/1108.3533">pdf</a>, <a href="https://arxiv.org/format/1108.3533">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Reply to Comment on "High-Precision Determination of the Electric and Magnetic Form Factors of the Proton" </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Bernauer%2C+J+C">J. C. Bernauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">R. B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=Debenjak%2C+L">L. Debenjak</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Doria%2C+L">L. Doria</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Fonvieille%2C+H">H. Fonvieille</a>, <a href="/search/nucl-ex?searchtype=author&query=Friedrich%2C+J+M">J. M. Friedrich</a>, <a href="/search/nucl-ex?searchtype=author&query=Friedrich%2C+J">J. Friedrich</a>, <a href="/search/nucl-ex?searchtype=author&query=de+la+Paz%2C+M+G+R">M. G贸mez Rodr铆guez de la Paz</a>, <a href="/search/nucl-ex?searchtype=author&query=Makek%2C+M">M. Makek</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Middleton%2C+D+G">D. G. Middleton</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">U. M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Nungesser%2C+L">L. Nungesser</a>, <a href="/search/nucl-ex?searchtype=author&query=Pochodzalla%2C+J">J. Pochodzalla</a>, <a href="/search/nucl-ex?searchtype=author&query=Potokar%2C+M">M. Potokar</a>, <a href="/search/nucl-ex?searchtype=author&query=Majos%2C+S+S">S. S谩nchez Majos</a>, <a href="/search/nucl-ex?searchtype=author&query=Schlimme%2C+B+S">B. S. Schlimme</a>, <a href="/search/nucl-ex?searchtype=author&query=%C5%A0irca%2C+S">S. 艩irca</a>, <a href="/search/nucl-ex?searchtype=author&query=Walcher%2C+T">Th. Walcher</a>, <a href="/search/nucl-ex?searchtype=author&query=Weinriefer%2C+M">M. Weinriefer</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1108.3533v1-abstract-short" style="display: inline;"> In arXiv:1108.3058v1 [nucl-ex], Arrington criticizes the Coulomb corrections we applied in the analysis of high precision form factor data (see Phys.Rev.Lett.105:242001, 2010, arXiv:1007.5076v3 [nucl-ex]). We show, by comparing different calculations cited in the Comment, that the criticism of the Comment neglects the large uncertainty of "more modern" TPE corrections. This uncertainty has also be… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1108.3533v1-abstract-full').style.display = 'inline'; document.getElementById('1108.3533v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1108.3533v1-abstract-full" style="display: none;"> In arXiv:1108.3058v1 [nucl-ex], Arrington criticizes the Coulomb corrections we applied in the analysis of high precision form factor data (see Phys.Rev.Lett.105:242001, 2010, arXiv:1007.5076v3 [nucl-ex]). We show, by comparing different calculations cited in the Comment, that the criticism of the Comment neglects the large uncertainty of "more modern" TPE corrections. This uncertainty has also been seen in recent polarized measurements. We rerun our analysis using one of these calculations. The results show that the Comment exaggerates the quantitative effect at small Q^2. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1108.3533v1-abstract-full').style.display = 'none'; document.getElementById('1108.3533v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 August, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">1 page, 2 figure, To appear as a Reply Comment in Physical Review Letters</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1105.0193">arXiv:1105.0193</a> <span> [<a href="https://arxiv.org/pdf/1105.0193">pdf</a>, <a href="https://arxiv.org/format/1105.0193">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1109/TNS.2011.2157523">10.1109/TNS.2011.2157523 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A Large-Scale FPGA-Based Trigger and Dead-Time Free DAQ System for the Kaos Spectrometer at MAMI </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Bernauer%2C+J+C">J. C. Bernauer</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">R. B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=Debenjak%2C+L">L. Debenjak</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Fri%C5%A1%C4%8Di%C4%87%2C+I">I. Fri拧膷i膰</a>, <a href="/search/nucl-ex?searchtype=author&query=de+la+Paz%2C+M+G+R">M. G贸mez Rodr铆guez de la Paz</a>, <a href="/search/nucl-ex?searchtype=author&query=Hoffmann%2C+J">J. Hoffmann</a>, <a href="/search/nucl-ex?searchtype=author&query=Makek%2C+M">M. Makek</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Minami%2C+S">S. Minami</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">U. M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Nungesser%2C+L">L. Nungesser</a>, <a href="/search/nucl-ex?searchtype=author&query=Ott%2C+W">W. Ott</a>, <a href="/search/nucl-ex?searchtype=author&query=Pochodzalla%2C+J">J. Pochodzalla</a>, <a href="/search/nucl-ex?searchtype=author&query=Potokar%2C+M">M. Potokar</a>, <a href="/search/nucl-ex?searchtype=author&query=Rusanov%2C+I">I. Rusanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Saito%2C+T+R">T. R. Saito</a>, <a href="/search/nucl-ex?searchtype=author&query=Majos%2C+S+S">S. S谩nchez Majos</a>, <a href="/search/nucl-ex?searchtype=author&query=Schlimme%2C+B+S">B. S. Schlimme</a>, <a href="/search/nucl-ex?searchtype=author&query=%C5%A0irca%2C+S">S. 艩irca</a>, <a href="/search/nucl-ex?searchtype=author&query=Voltz%2C+S">S. Voltz</a> , et al. (2 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1105.0193v1-abstract-short" style="display: inline;"> The Kaos spectrometer is maintained by the A1 collaboration at the Mainz Microtron MAMI with a focus on the study of (e,e'K^+) coincidence reactions. For its electron-arm two vertical planes of fiber arrays, each comprising approximately 10 000 fibers, are operated close to zero degree scattering angle and in close proximity to the electron beam. A nearly dead-time free DAQ system to acquire timin… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1105.0193v1-abstract-full').style.display = 'inline'; document.getElementById('1105.0193v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1105.0193v1-abstract-full" style="display: none;"> The Kaos spectrometer is maintained by the A1 collaboration at the Mainz Microtron MAMI with a focus on the study of (e,e'K^+) coincidence reactions. For its electron-arm two vertical planes of fiber arrays, each comprising approximately 10 000 fibers, are operated close to zero degree scattering angle and in close proximity to the electron beam. A nearly dead-time free DAQ system to acquire timing and tracking information has been installed for this spectrometer arm. The signals of 144 multi-anode photomultipliers are collected by 96-channel front-end boards, digitized by double-threshold discriminators and the signal time is picked up by state-of-the-art F1 time-to-digital converter chips. In order to minimize background rates a sophisticated trigger logic was implemented in newly developed Vuprom modules. The trigger performs noise suppression, signal cluster finding, particle tracking, and coincidence timing, and can be expanded for kinematical matching (e'K^+) coincidences. The full system was designed to process more than 4 000 read-out channels and to cope with the high electron flux in the spectrometer and the high count rate requirement of the detectors. It was successfully in-beam tested at MAMI in 2009. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1105.0193v1-abstract-full').style.display = 'none'; document.getElementById('1105.0193v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 May, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Contributed to 17th IEEE Real Time Conference (RT10), Lisbon, 24-28 May 2010</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> IEEE Transactions on Nuclear Science, Vol. 58, No. 4, 2011, PAGE 1677 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1104.4254">arXiv:1104.4254</a> <span> [<a href="https://arxiv.org/pdf/1104.4254">pdf</a>, <a href="https://arxiv.org/ps/1104.4254">ps</a>, <a href="https://arxiv.org/format/1104.4254">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2011.03.039">10.1016/j.nima.2011.03.039 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Particle tracking in kaon electroproduction with cathode-charge sampling in multi-wire proportional chambers </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Bernauer%2C+J+C">J. C. Bernauer</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">R. B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6sz%2C+M">M. B枚sz</a>, <a href="/search/nucl-ex?searchtype=author&query=Debenjak%2C+L">L. Debenjak</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Fri%C5%A1%C4%8Di%C4%87%2C+I">I. Fri拧膷i膰</a>, <a href="/search/nucl-ex?searchtype=author&query=de+la+Paz%2C+M+G+R">M. G贸mez Rodr铆guez de la Paz</a>, <a href="/search/nucl-ex?searchtype=author&query=Makek%2C+M">M. Makek</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">U. M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Nungesser%2C+L">L. Nungesser</a>, <a href="/search/nucl-ex?searchtype=author&query=Pochodzalla%2C+J">J. Pochodzalla</a>, <a href="/search/nucl-ex?searchtype=author&query=Potokar%2C+M">M. Potokar</a>, <a href="/search/nucl-ex?searchtype=author&query=Majos%2C+S+S">S. S谩nchez Majos</a>, <a href="/search/nucl-ex?searchtype=author&query=Schlimme%2C+B+S">B. S. Schlimme</a>, <a href="/search/nucl-ex?searchtype=author&query=%C5%A0irca%2C+S">S. 艩irca</a>, <a href="/search/nucl-ex?searchtype=author&query=Weinriefer%2C+M">M. Weinriefer</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1104.4254v1-abstract-short" style="display: inline;"> Wire chambers are routinely operated as tracking detectors in magnetic spectrometers at high-intensity continuous electron beams. Especially in experiments studying reactions with small cross-sections the reaction yield is limited by the background rate in the chambers. One way to determine the track of a charged particle through a multi-wire proportional chamber (MWPC) is the measurement of the c… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1104.4254v1-abstract-full').style.display = 'inline'; document.getElementById('1104.4254v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1104.4254v1-abstract-full" style="display: none;"> Wire chambers are routinely operated as tracking detectors in magnetic spectrometers at high-intensity continuous electron beams. Especially in experiments studying reactions with small cross-sections the reaction yield is limited by the background rate in the chambers. One way to determine the track of a charged particle through a multi-wire proportional chamber (MWPC) is the measurement of the charge distribution induced on its cathodes. In practical applications of this read-out method, the algorithm to relate the measured charge distribution to the avalanche position is an important factor for the achievable position resolution and for the track reconstruction efficiency. An algorithm was developed for operating two large-sized MWPCs in a strong background environment with multiple-particle tracks. Resulting efficiencies were determined as a function of the electron beam current and on the signal amplitudes. Because of the different energy-losses of pions, kaons, and protons in the momentum range of the spectrometer the efficiencies depend also on the particle species. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1104.4254v1-abstract-full').style.display = 'none'; document.getElementById('1104.4254v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 April, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl.Instrum.Meth.A641:105-113,2011 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1104.4245">arXiv:1104.4245</a> <span> [<a href="https://arxiv.org/pdf/1104.4245">pdf</a>, <a href="https://arxiv.org/ps/1104.4245">ps</a>, <a href="https://arxiv.org/format/1104.4245">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epja/i2012-12014-9">10.1140/epja/i2012-12014-9 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Exclusive electroproduction of K+ Lambda and K+ Sigma^0 final states at Q^2 = 0.030-0.055 (GeV/c)^2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Bernauer%2C+J+C">J. C. Bernauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Bianchin%2C+S">S. Bianchin</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">R. B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Borodina%2C+O">O. Borodina</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6sz%2C+M">M. B枚sz</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=Bozkurt%2C+V">V. Bozkurt</a>, <a href="/search/nucl-ex?searchtype=author&query=Byd%C5%BEovsk%C3%BD%2C+P">P. Byd啪ovsk媒</a>, <a href="/search/nucl-ex?searchtype=author&query=Debenjak%2C+L">L. Debenjak</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Fri%C5%A1%C4%8Di%C4%87%2C+I">I. Fri拧膷i膰</a>, <a href="/search/nucl-ex?searchtype=author&query=G%C3%B6k%C3%BCz%C3%BCm%2C+B">B. G枚k眉z眉m</a>, <a href="/search/nucl-ex?searchtype=author&query=de+la+Paz%2C+M+G+R">M. G贸mez Rodr铆guez de la Paz</a>, <a href="/search/nucl-ex?searchtype=author&query=Grie%C3%9Finger%2C+K">K. Grie脽inger</a>, <a href="/search/nucl-ex?searchtype=author&query=Jennewein%2C+P">P. Jennewein</a>, <a href="/search/nucl-ex?searchtype=author&query=Kim%2C+E">E. Kim</a>, <a href="/search/nucl-ex?searchtype=author&query=Makek%2C+M">M. Makek</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Minami%2C+S">S. Minami</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">U. M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Nakajima%2C+D">D. Nakajima</a>, <a href="/search/nucl-ex?searchtype=author&query=Nungesser%2C+L">L. Nungesser</a> , et al. (10 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1104.4245v3-abstract-short" style="display: inline;"> Cross section measurements of the exclusive p(e,e'K+)Lambda,Sigma^0 electroproduction reactions have been performed at the Mainz Microtron MAMI in the A1 spectrometer facility using for the first time the Kaos spectrometer for kaon detection. These processes were studied in a kinematical region not covered by any previous experiment. The nucleon was probed in its third resonance region with virtua… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1104.4245v3-abstract-full').style.display = 'inline'; document.getElementById('1104.4245v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1104.4245v3-abstract-full" style="display: none;"> Cross section measurements of the exclusive p(e,e'K+)Lambda,Sigma^0 electroproduction reactions have been performed at the Mainz Microtron MAMI in the A1 spectrometer facility using for the first time the Kaos spectrometer for kaon detection. These processes were studied in a kinematical region not covered by any previous experiment. The nucleon was probed in its third resonance region with virtual photons of low four-momenta, Q^2= 0.030-0.055 (GeV/c)^2. The MAMI data indicate a smooth transition in Q^2 from photoproduction to electroproduction cross sections. Comparison with predictions of effective Lagrangian models based on the isobar approach reveal that strong longitudinal couplings of the virtual photon to the N* resonances can be excluded from these models. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1104.4245v3-abstract-full').style.display = 'none'; document.getElementById('1104.4245v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 November, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 April, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16 pages, 7 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1101.4091">arXiv:1101.4091</a> <span> [<a href="https://arxiv.org/pdf/1101.4091">pdf</a>, <a href="https://arxiv.org/ps/1101.4091">ps</a>, <a href="https://arxiv.org/format/1101.4091">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.106.251802">10.1103/PhysRevLett.106.251802 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for Light Gauge Bosons of the Dark Sector at the Mainz Microtron </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=Bernauer%2C+J+C">J. C. Bernauer</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">R. B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=Debenjak%2C+L">L. Debenjak</a>, <a href="/search/nucl-ex?searchtype=author&query=Denig%2C+A">A. Denig</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Fonvieille%2C+H">H. Fonvieille</a>, <a href="/search/nucl-ex?searchtype=author&query=Fri%C5%A1%C4%8Di%C4%87%2C+I">I. Fri拧膷i膰</a>, <a href="/search/nucl-ex?searchtype=author&query=Middleton%2C+D+G">D. G. Middleton</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">U. M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Nungesser%2C+L">L. Nungesser</a>, <a href="/search/nucl-ex?searchtype=author&query=Pochodzalla%2C+J">J. Pochodzalla</a>, <a href="/search/nucl-ex?searchtype=author&query=Rohrbeck%2C+M">M. Rohrbeck</a>, <a href="/search/nucl-ex?searchtype=author&query=Majos%2C+S+S">S. S谩nchez Majos</a>, <a href="/search/nucl-ex?searchtype=author&query=Schlimme%2C+B+S">B. S. Schlimme</a>, <a href="/search/nucl-ex?searchtype=author&query=Schoth%2C+M">M. Schoth</a>, <a href="/search/nucl-ex?searchtype=author&query=%C5%A0irca%2C+S">S. 艩irca</a>, <a href="/search/nucl-ex?searchtype=author&query=Weinriefer%2C+M">M. Weinriefer</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1101.4091v2-abstract-short" style="display: inline;"> A new exclusion limit for the electromagnetic production of a light U(1) gauge boson 纬' decaying to e^+e^- was determined by the A1 Collaboration at the Mainz Microtron. Such light gauge bosons appear in several extensions of the standard model and are also discussed as candidates for the interaction of dark matter with standard model matter. In electron scattering from a heavy nucleus, the existi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1101.4091v2-abstract-full').style.display = 'inline'; document.getElementById('1101.4091v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1101.4091v2-abstract-full" style="display: none;"> A new exclusion limit for the electromagnetic production of a light U(1) gauge boson 纬' decaying to e^+e^- was determined by the A1 Collaboration at the Mainz Microtron. Such light gauge bosons appear in several extensions of the standard model and are also discussed as candidates for the interaction of dark matter with standard model matter. In electron scattering from a heavy nucleus, the existing limits for a narrow state coupling to e^+e^- were reduced by nearly an order of magnitude in the range of the lepton pair mass of 210 MeV/c^2 < m_e^+e^- < 300 MeV/c^2. This experiment demonstrates the potential of high current and high resolution fixed target experiments for the search for physics beyond the standard model. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1101.4091v2-abstract-full').style.display = 'none'; document.getElementById('1101.4091v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 June, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 January, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, 7 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.Lett.106:251802,2011 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1007.5076">arXiv:1007.5076</a> <span> [<a href="https://arxiv.org/pdf/1007.5076">pdf</a>, <a href="https://arxiv.org/ps/1007.5076">ps</a>, <a href="https://arxiv.org/format/1007.5076">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.105.242001">10.1103/PhysRevLett.105.242001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> High-precision determination of the electric and magnetic form factors of the proton </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Bernauer%2C+J+C">J. C. Bernauer</a>, <a href="/search/nucl-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/nucl-ex?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/nucl-ex?searchtype=author&query=B%C3%B6hm%2C+R">R. B枚hm</a>, <a href="/search/nucl-ex?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/nucl-ex?searchtype=author&query=Debenjak%2C+L">L. Debenjak</a>, <a href="/search/nucl-ex?searchtype=author&query=Distler%2C+M+O">M. O. Distler</a>, <a href="/search/nucl-ex?searchtype=author&query=Doria%2C+L">L. Doria</a>, <a href="/search/nucl-ex?searchtype=author&query=Esser%2C+A">A. Esser</a>, <a href="/search/nucl-ex?searchtype=author&query=Fonvieille%2C+H">H. Fonvieille</a>, <a href="/search/nucl-ex?searchtype=author&query=Friedrich%2C+J+M">J. M. Friedrich</a>, <a href="/search/nucl-ex?searchtype=author&query=Friedrich%2C+J">J. Friedrich</a>, <a href="/search/nucl-ex?searchtype=author&query=de+la+Paz%2C+M+G+R">M. G贸mez Rodr铆guez de la Paz</a>, <a href="/search/nucl-ex?searchtype=author&query=Makek%2C+M">M. Makek</a>, <a href="/search/nucl-ex?searchtype=author&query=Merkel%2C+H">H. Merkel</a>, <a href="/search/nucl-ex?searchtype=author&query=Middleton%2C+D+G">D. G. Middleton</a>, <a href="/search/nucl-ex?searchtype=author&query=M%C3%BCller%2C+U">U. M眉ller</a>, <a href="/search/nucl-ex?searchtype=author&query=Nungesser%2C+L">L. Nungesser</a>, <a href="/search/nucl-ex?searchtype=author&query=Pochodzalla%2C+J">J. Pochodzalla</a>, <a href="/search/nucl-ex?searchtype=author&query=Potokar%2C+M">M. Potokar</a>, <a href="/search/nucl-ex?searchtype=author&query=Majos%2C+S+S">S. S谩nchez Majos</a>, <a href="/search/nucl-ex?searchtype=author&query=Schlimme%2C+B+S">B. S. Schlimme</a>, <a href="/search/nucl-ex?searchtype=author&query=%C5%A0irca%2C+S">S. 艩irca</a>, <a href="/search/nucl-ex?searchtype=author&query=Walcher%2C+T">Th. Walcher</a>, <a href="/search/nucl-ex?searchtype=author&query=Weinriefer%2C+M">M. Weinriefer</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1007.5076v3-abstract-short" style="display: inline;"> New precise results of a measurement of the elastic electron-proton scattering cross section performed at the Mainz Microtron MAMI are presented. About 1400 cross sections were measured with negative four-momentum transfers squared up to Q^2=1 (GeV/c)^2 with statistical errors below 0.2%. The electric and magnetic form factors of the proton were extracted by fits of a large variety of form factor… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1007.5076v3-abstract-full').style.display = 'inline'; document.getElementById('1007.5076v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1007.5076v3-abstract-full" style="display: none;"> New precise results of a measurement of the elastic electron-proton scattering cross section performed at the Mainz Microtron MAMI are presented. About 1400 cross sections were measured with negative four-momentum transfers squared up to Q^2=1 (GeV/c)^2 with statistical errors below 0.2%. The electric and magnetic form factors of the proton were extracted by fits of a large variety of form factor models directly to the cross sections. The form factors show some features at the scale of the pion cloud. The charge and magnetic radii are determined to be r_E=0.879(5)(stat.)(4)(syst.)(2)(model)(4)(group) fm and r_M=0.777(13)(stat.)(9)(syst.)(5)(model)(2)(group) fm. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1007.5076v3-abstract-full').style.display = 'none'; document.getElementById('1007.5076v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 December, 2010; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 July, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2010. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 2 figures, published in Phys. Rev. Lett. v3: added references, updated text, color figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.Lett.105:242001,2010 </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 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