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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/2501.00746">arXiv:2501.00746</a> <span> [<a href="https://arxiv.org/pdf/2501.00746">pdf</a>, <a href="https://arxiv.org/format/2501.00746">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> <p class="title is-5 mathjax"> Comprehensive Measurement of the Reactor Antineutrino Spectrum and Flux at Daya Bay </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=An%2C+F+P">F. P. An</a>, <a href="/search/nucl-ex?searchtype=author&query=Bai%2C+W+D">W. D. Bai</a>, <a href="/search/nucl-ex?searchtype=author&query=Balantekin%2C+A+B">A. B. Balantekin</a>, <a href="/search/nucl-ex?searchtype=author&query=Bishai%2C+M">M. Bishai</a>, <a href="/search/nucl-ex?searchtype=author&query=Blyth%2C+S">S. Blyth</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+G+F">G. F. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+J">J. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+J+F">J. F. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+Y">Y. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+H+S">H. S. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+H+Y">H. Y. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+S+M">S. M. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+Y">Y. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+Y+X">Y. X. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+Z+Y">Z. Y. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Cheng%2C+J">J. Cheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Cheng%2C+J">J. Cheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Cheng%2C+Y+-">Y. -C. Cheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Cheng%2C+Z+K">Z. K. Cheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Cherwinka%2C+J+J">J. J. Cherwinka</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+M+C">M. C. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Cummings%2C+J+P">J. P. Cummings</a>, <a href="/search/nucl-ex?searchtype=author&query=Dalager%2C+O">O. Dalager</a>, <a href="/search/nucl-ex?searchtype=author&query=Deng%2C+F+S">F. S. Deng</a>, <a href="/search/nucl-ex?searchtype=author&query=Ding%2C+X+Y">X. Y. Ding</a> , et al. (177 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="2501.00746v1-abstract-short" style="display: inline;"> This Letter reports the precise measurement of reactor antineutrino spectrum and flux based on the full data set of 4.7 million inverse-beta-decay (IBD) candidates collected at Daya Bay near detectors. Expressed in terms of the IBD yield per fission, the antineutrino spectra from all reactor fissile isotopes and the specific $\mathrm{^{235}U}$ and $\mathrm{^{239}Pu}$ isotopes are measured with 1.3… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.00746v1-abstract-full').style.display = 'inline'; document.getElementById('2501.00746v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2501.00746v1-abstract-full" style="display: none;"> This Letter reports the precise measurement of reactor antineutrino spectrum and flux based on the full data set of 4.7 million inverse-beta-decay (IBD) candidates collected at Daya Bay near detectors. Expressed in terms of the IBD yield per fission, the antineutrino spectra from all reactor fissile isotopes and the specific $\mathrm{^{235}U}$ and $\mathrm{^{239}Pu}$ isotopes are measured with 1.3$\%$, 3$\%$ and 8$\%$ uncertainties respectively near the 3 MeV spectrum peak in reconstructed energy, reaching the best precision in the world. The total antineutrino flux and isotopic $\mathrm{^{235}U}$ and $\mathrm{^{239}Pu}$ fluxes are precisely measured to be $5.84\pm0.07$, $6.16\pm0.12$ and $4.16\pm0.21$ in units of $10^{-43} \mathrm{cm^2/fission}$. These measurements are compared with the Huber-Mueller (HM) model, the reevaluated conversion model based on the Kurchatov Institute (KI) measurement and the latest Summation Model (SM2023). The Daya Bay flux shows good consistency with KI and SM2023 models, but disagrees with HM model. The Daya Bay spectrum, however, disagrees with all model predictions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.00746v1-abstract-full').style.display = 'none'; document.getElementById('2501.00746v1-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 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2025. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2406.11459">arXiv:2406.11459</a> <span> [<a href="https://arxiv.org/pdf/2406.11459">pdf</a>, <a href="https://arxiv.org/format/2406.11459">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/10.1016/j.physletb.2024.139032">10.1016/j.physletb.2024.139032 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of $J/蠄$ and $蠄\left(2S\right)$ production in $p+p$ and $p+d$ interactions at 120 GeV </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Leung%2C+C+H">C. H. Leung</a>, <a href="/search/nucl-ex?searchtype=author&query=Nagai%2C+K">K. Nagai</a>, <a href="/search/nucl-ex?searchtype=author&query=Nakano%2C+K">K. Nakano</a>, <a href="/search/nucl-ex?searchtype=author&query=Nawarathne%2C+D">D. Nawarathne</a>, <a href="/search/nucl-ex?searchtype=author&query=Dove%2C+J">J. Dove</a>, <a href="/search/nucl-ex?searchtype=author&query=Prasad%2C+S">S. Prasad</a>, <a href="/search/nucl-ex?searchtype=author&query=Wuerfel%2C+N">N. Wuerfel</a>, <a href="/search/nucl-ex?searchtype=author&query=Aidala%2C+C+A">C. A. Aidala</a>, <a href="/search/nucl-ex?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Ayuso%2C+C">C. Ayuso</a>, <a href="/search/nucl-ex?searchtype=author&query=Barker%2C+C+L">C. L. Barker</a>, <a href="/search/nucl-ex?searchtype=author&query=Brown%2C+C+N">C. N. Brown</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+W+C">W. C. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+A">A. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Christian%2C+D+C">D. C. Christian</a>, <a href="/search/nucl-ex?searchtype=author&query=Dannowitz%2C+B+P">B. P. Dannowitz</a>, <a href="/search/nucl-ex?searchtype=author&query=Daugherity%2C+M">M. Daugherity</a>, <a href="/search/nucl-ex?searchtype=author&query=Fassi%2C+L+E">L. El Fassi</a>, <a href="/search/nucl-ex?searchtype=author&query=Geesaman%2C+D+F">D. F. Geesaman</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilman%2C+R">R. Gilman</a>, <a href="/search/nucl-ex?searchtype=author&query=Goto%2C+Y">Y. Goto</a>, <a href="/search/nucl-ex?searchtype=author&query=Guo%2C+R">R. Guo</a>, <a href="/search/nucl-ex?searchtype=author&query=Hague%2C+T+J">T. J. Hague</a>, <a href="/search/nucl-ex?searchtype=author&query=Holt%2C+R+J">R. J. Holt</a>, <a href="/search/nucl-ex?searchtype=author&query=Hossain%2C+M+F">M. F. Hossain</a> , et al. (36 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="2406.11459v3-abstract-short" style="display: inline;"> We report the $p+p$ and $p+d$ differential cross sections measured in the SeaQuest experiment for $J/蠄$ and $蠄\left(2S\right)$ production at 120 GeV beam energy covering the forward $x$-Feynman ($x_F$) range of $0.5 < x_F <0.9$. The measured cross sections are in good agreement with theoretical calculations based on the nonrelativistic QCD (NRQCD) using the long-distance matrix elements deduced fr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.11459v3-abstract-full').style.display = 'inline'; document.getElementById('2406.11459v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.11459v3-abstract-full" style="display: none;"> We report the $p+p$ and $p+d$ differential cross sections measured in the SeaQuest experiment for $J/蠄$ and $蠄\left(2S\right)$ production at 120 GeV beam energy covering the forward $x$-Feynman ($x_F$) range of $0.5 < x_F <0.9$. The measured cross sections are in good agreement with theoretical calculations based on the nonrelativistic QCD (NRQCD) using the long-distance matrix elements deduced from a recent global analysis of proton- and pion-induced charmonium production data. The $蟽_{蠄\left(2S\right)} / 蟽_{J/蠄}$ cross section ratios are found to increase as $x_F$ increases, indicating that the $q \bar{q}$ annihilation process has larger contributions in the $蠄\left(2S\right)$ production than the $J/蠄$ production. The $蟽_{pd}/2蟽_{pp}$ cross section ratios are observed to be significantly different for the Drell-Yan process and $J/蠄$ production, reflecting their different production mechanisms. We find that the $蟽_{pd}/2蟽_{pp}$ ratios for $J/蠄$ production at the forward $x_F$ region are sensitive to the $\bar{d}/ \bar{u}$ flavor asymmetry of the proton sea, analogous to the Drell-Yan process. The transverse momentum ($p_T$) distributions for $J/蠄$ and $蠄\left(2S\right)$ production are also presented and compared with data collected at higher center-of-mass energies. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.11459v3-abstract-full').style.display = 'none'; document.getElementById('2406.11459v3-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 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2024. </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">8 pages, 7 figures, with 1 page of supplementary material which has 2 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Lett. B 858, 139032 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2402.05383">arXiv:2402.05383</a> <span> [<a href="https://arxiv.org/pdf/2402.05383">pdf</a>, <a href="https://arxiv.org/format/2402.05383">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> <p class="title is-5 mathjax"> First measurement of the yield of $^8$He isotopes produced in liquid scintillator by cosmic-ray muons at Daya Bay </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Daya+Bay+Collaboration"> Daya Bay Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=An%2C+F+P">F. P. An</a>, <a href="/search/nucl-ex?searchtype=author&query=Bai%2C+W+D">W. D. Bai</a>, <a href="/search/nucl-ex?searchtype=author&query=Balantekin%2C+A+B">A. B. Balantekin</a>, <a href="/search/nucl-ex?searchtype=author&query=Bishai%2C+M">M. Bishai</a>, <a href="/search/nucl-ex?searchtype=author&query=Blyth%2C+S">S. Blyth</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+G+F">G. F. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+J">J. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+J+F">J. F. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+Y">Y. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+H+S">H. S. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+H+Y">H. Y. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+S+M">S. M. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+Y">Y. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+Y+X">Y. X. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+Z+Y">Z. Y. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Cheng%2C+J">J. Cheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Cheng%2C+Y+C">Y. C. Cheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Cheng%2C+Z+K">Z. K. Cheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Cherwinka%2C+J+J">J. J. Cherwinka</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+M+C">M. C. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Cummings%2C+J+P">J. P. Cummings</a>, <a href="/search/nucl-ex?searchtype=author&query=Dalager%2C+O">O. Dalager</a>, <a href="/search/nucl-ex?searchtype=author&query=Deng%2C+F+S">F. S. Deng</a>, <a href="/search/nucl-ex?searchtype=author&query=Ding%2C+X+Y">X. Y. Ding</a> , et al. (177 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="2402.05383v1-abstract-short" style="display: inline;"> Daya Bay presents the first measurement of cosmogenic $^8$He isotope production in liquid scintillator, using an innovative method for identifying cascade decays of $^8$He and its child isotope, $^8$Li. We also measure the production yield of $^9$Li isotopes using well-established methodology. The results, in units of 10$^{-8}渭^{-1}$g$^{-1}$cm$^{2}$, are 0.307$\pm$0.042, 0.341$\pm$0.040, and 0.546… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.05383v1-abstract-full').style.display = 'inline'; document.getElementById('2402.05383v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.05383v1-abstract-full" style="display: none;"> Daya Bay presents the first measurement of cosmogenic $^8$He isotope production in liquid scintillator, using an innovative method for identifying cascade decays of $^8$He and its child isotope, $^8$Li. We also measure the production yield of $^9$Li isotopes using well-established methodology. The results, in units of 10$^{-8}渭^{-1}$g$^{-1}$cm$^{2}$, are 0.307$\pm$0.042, 0.341$\pm$0.040, and 0.546$\pm$0.076 for $^8$He, and 6.73$\pm$0.73, 6.75$\pm$0.70, and 13.74$\pm$0.82 for $^9$Li at average muon energies of 63.9~GeV, 64.7~GeV, and 143.0~GeV, respectively. The measured production rate of $^8$He isotopes is more than an order of magnitude lower than any other measurement of cosmogenic isotope production. It replaces the results of previous attempts to determine the ratio of $^8$He to $^9$Li production that yielded a wide range of limits from 0 to 30\%. The results provide future liquid-scintillator-based experiments with improved ability to predict cosmogenic backgrounds. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.05383v1-abstract-full').style.display = 'none'; document.getElementById('2402.05383v1-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 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2212.12160">arXiv:2212.12160</a> <span> [<a href="https://arxiv.org/pdf/2212.12160">pdf</a>, <a href="https://arxiv.org/format/2212.12160">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="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/PhysRevC.108.035202">10.1103/PhysRevC.108.035202 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of flavor asymmetry of light-quark sea in the proton with Drell-Yan dimuon production in $p+p$ and $p+d$ collisions at 120 GeV </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Dove%2C+J">J. Dove</a>, <a href="/search/nucl-ex?searchtype=author&query=Kerns%2C+B">B. Kerns</a>, <a href="/search/nucl-ex?searchtype=author&query=Leung%2C+C">C. Leung</a>, <a href="/search/nucl-ex?searchtype=author&query=McClellan%2C+R+E">R. E. McClellan</a>, <a href="/search/nucl-ex?searchtype=author&query=Miyasaka%2C+S">S. Miyasaka</a>, <a href="/search/nucl-ex?searchtype=author&query=Morton%2C+D+H">D. H. Morton</a>, <a href="/search/nucl-ex?searchtype=author&query=Nagai%2C+K">K. Nagai</a>, <a href="/search/nucl-ex?searchtype=author&query=Prasad%2C+S">S. Prasad</a>, <a href="/search/nucl-ex?searchtype=author&query=Sanftl%2C+F">F. Sanftl</a>, <a href="/search/nucl-ex?searchtype=author&query=Scott%2C+M+B+C">M. B. C. Scott</a>, <a href="/search/nucl-ex?searchtype=author&query=Tadepalli%2C+A+S">A. S. Tadepalli</a>, <a href="/search/nucl-ex?searchtype=author&query=Aidala%2C+C+A">C. A. Aidala</a>, <a href="/search/nucl-ex?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Ayuso%2C+C">C. Ayuso</a>, <a href="/search/nucl-ex?searchtype=author&query=Barker%2C+C+T">C. T. Barker</a>, <a href="/search/nucl-ex?searchtype=author&query=Brown%2C+C+N">C. N. Brown</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+T+H">T. H. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+W+C">W. C. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+A">A. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Christian%2C+D+C">D. C. Christian</a>, <a href="/search/nucl-ex?searchtype=author&query=Dannowitz%2C+B+P">B. P. Dannowitz</a>, <a href="/search/nucl-ex?searchtype=author&query=Daugherity%2C+M">M. Daugherity</a>, <a href="/search/nucl-ex?searchtype=author&query=Diefenthaler%2C+M">M. Diefenthaler</a>, <a href="/search/nucl-ex?searchtype=author&query=Fassi%2C+L+E">L. El Fassi</a>, <a href="/search/nucl-ex?searchtype=author&query=Geesaman%2C+D+F">D. F. Geesaman</a> , et al. (44 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="2212.12160v4-abstract-short" style="display: inline;"> Evidence for a flavor asymmetry between the $\bar u$ and $\bar d$ quark distributions in the proton has been found in deep-inelastic scattering and Drell-Yan experiments. The pronounced dependence of this flavor asymmetry on $x$ (fraction of nucleon momentum carried by partons) observed in the Fermilab E866 Drell-Yan experiment suggested a drop of the $\bar d\left(x\right) / \bar u\left(x\right)$… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.12160v4-abstract-full').style.display = 'inline'; document.getElementById('2212.12160v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2212.12160v4-abstract-full" style="display: none;"> Evidence for a flavor asymmetry between the $\bar u$ and $\bar d$ quark distributions in the proton has been found in deep-inelastic scattering and Drell-Yan experiments. The pronounced dependence of this flavor asymmetry on $x$ (fraction of nucleon momentum carried by partons) observed in the Fermilab E866 Drell-Yan experiment suggested a drop of the $\bar d\left(x\right) / \bar u\left(x\right)$ ratio in the $x > 0.15$ region. We report results from the SeaQuest Fermilab E906 experiment with improved statistical precision for $\bar d\left(x\right) / \bar u\left(x\right)$ in the large $x$ region up to $x=0.45$ using the 120 GeV proton beam. Two different methods for extracting the Drell-Yan cross section ratios, $蟽^{pd} /2 蟽^{pp}$, from the SeaQuest data give consistent results. The $\bar{d}\left(x\right) / \bar{u}\left(x\right)$ ratios and the $\bar d\left(x\right) - \bar u\left(x\right)$ differences are deduced from these cross section ratios for $0.13 < x < 0.45$. The SeaQuest and E866/NuSea $\bar{d}\left(x\right) / \bar{u}\left(x\right)$ ratios are in good agreement for the $x\lesssim 0.25$ region. The new SeaQuest data, however, show that $\bar d\left(x\right)$ continues to be greater than $\bar u\left(x\right)$ up to the highest $x$ value ($x = 0.45$). The new results on $\bar{d}\left(x\right) / \bar{u}\left(x\right)$ and $\bar{d}\left(x\right) - \bar{u}\left(x\right)$ are compared with various parton distribution functions and theoretical calculations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.12160v4-abstract-full').style.display = 'none'; document.getElementById('2212.12160v4-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 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 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">Journal ref:</span> Phys. Rev. C 108, 035202 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.06686">arXiv:2203.06686</a> <span> [<a href="https://arxiv.org/pdf/2203.06686">pdf</a>, <a href="https://arxiv.org/format/2203.06686">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.129.041801">10.1103/PhysRevLett.129.041801 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First measurement of high-energy reactor antineutrinos at Daya Bay </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Daya+Bay+collaboration"> Daya Bay collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=An%2C+F+P">F. P. An</a>, <a href="/search/nucl-ex?searchtype=author&query=Balantekin%2C+A+B">A. B. Balantekin</a>, <a href="/search/nucl-ex?searchtype=author&query=Band%2C+H+R">H. R. Band</a>, <a href="/search/nucl-ex?searchtype=author&query=Bishai%2C+M">M. Bishai</a>, <a href="/search/nucl-ex?searchtype=author&query=Blyth%2C+S">S. Blyth</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+G+F">G. F. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+J">J. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+J+F">J. F. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+Y">Y. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+H+S">H. S. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+S+M">S. M. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+Y">Y. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+Y+X">Y. X. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Cheng%2C+J">J. Cheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Cheng%2C+Z+K">Z. K. Cheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Cherwinka%2C+J+J">J. J. Cherwinka</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+M+C">M. C. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Cummings%2C+J+P">J. P. Cummings</a>, <a href="/search/nucl-ex?searchtype=author&query=Dalager%2C+O">O. Dalager</a>, <a href="/search/nucl-ex?searchtype=author&query=Deng%2C+F+S">F. S. Deng</a>, <a href="/search/nucl-ex?searchtype=author&query=Ding%2C+Y+Y">Y. Y. Ding</a>, <a href="/search/nucl-ex?searchtype=author&query=Diwan%2C+M+V">M. V. Diwan</a>, <a href="/search/nucl-ex?searchtype=author&query=Dohnal%2C+T">T. Dohnal</a>, <a href="/search/nucl-ex?searchtype=author&query=Dove%2C+J">J. Dove</a> , et al. (162 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="2203.06686v2-abstract-short" style="display: inline;"> This Letter reports the first measurement of high-energy reactor antineutrinos at Daya Bay, with nearly 9000 inverse beta decay candidates in the prompt energy region of 8-12~MeV observed over 1958 days of data collection. A multivariate analysis is used to separate 2500 signal events from background statistically. The hypothesis of no reactor antineutrinos with neutrino energy above 10~MeV is rej… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.06686v2-abstract-full').style.display = 'inline'; document.getElementById('2203.06686v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.06686v2-abstract-full" style="display: none;"> This Letter reports the first measurement of high-energy reactor antineutrinos at Daya Bay, with nearly 9000 inverse beta decay candidates in the prompt energy region of 8-12~MeV observed over 1958 days of data collection. A multivariate analysis is used to separate 2500 signal events from background statistically. The hypothesis of no reactor antineutrinos with neutrino energy above 10~MeV is rejected with a significance of 6.2 standard deviations. A 29\% antineutrino flux deficit in the prompt energy region of 8-11~MeV is observed compared to a recent model prediction. We provide the unfolded antineutrino spectrum above 7 MeV as a data-based reference for other experiments. This result provides the first direct observation of the production of antineutrinos from several high-$Q_尾$ isotopes in commercial reactors. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.06686v2-abstract-full').style.display = 'none'; document.getElementById('2203.06686v2-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> 8 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 13 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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">7 pages, 4 figures, accepted by Physical Review Letters</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 129, 041801 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2106.12251">arXiv:2106.12251</a> <span> [<a href="https://arxiv.org/pdf/2106.12251">pdf</a>, <a href="https://arxiv.org/format/2106.12251">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.128.081801">10.1103/PhysRevLett.128.081801 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Joint Determination of Reactor Antineutrino Spectra from $^{235}$U and $^{239}$Pu Fission by Daya Bay and PROSPECT </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Daya+Bay+Collaboration"> Daya Bay Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=PROSPECT+Collaboration"> PROSPECT Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=An%2C+F+P">F. P. An</a>, <a href="/search/nucl-ex?searchtype=author&query=Andriamirado%2C+M">M. Andriamirado</a>, <a href="/search/nucl-ex?searchtype=author&query=Balantekin%2C+A+B">A. B. Balantekin</a>, <a href="/search/nucl-ex?searchtype=author&query=Band%2C+H+R">H. R. Band</a>, <a href="/search/nucl-ex?searchtype=author&query=Bass%2C+C+D">C. D. Bass</a>, <a href="/search/nucl-ex?searchtype=author&query=Bergeron%2C+D+E">D. E. Bergeron</a>, <a href="/search/nucl-ex?searchtype=author&query=Berish%2C+D">D. Berish</a>, <a href="/search/nucl-ex?searchtype=author&query=Bishai%2C+M">M. Bishai</a>, <a href="/search/nucl-ex?searchtype=author&query=Blyth%2C+S">S. Blyth</a>, <a href="/search/nucl-ex?searchtype=author&query=Bowden%2C+N+S">N. S. Bowden</a>, <a href="/search/nucl-ex?searchtype=author&query=Bryan%2C+C+D">C. D. Bryan</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+G+F">G. F. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+J">J. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+J+F">J. F. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+Y">Y. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+H+S">H. S. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+S+M">S. M. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+Y">Y. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+Y+X">Y. X. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Cheng%2C+J">J. Cheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Cheng%2C+Z+K">Z. K. Cheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Cherwinka%2C+J+J">J. J. Cherwinka</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+M+C">M. C. Chu</a> , et al. (217 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="2106.12251v2-abstract-short" style="display: inline;"> A joint determination of the reactor antineutrino spectra resulting from the fission of $^{235}$U and $^{239}$Pu has been carried out by the Daya Bay and PROSPECT collaborations. This Letter reports the level of consistency of $^{235}$U spectrum measurements from the two experiments and presents new results from a joint analysis of both data sets. The measurements are found to be consistent. The c… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.12251v2-abstract-full').style.display = 'inline'; document.getElementById('2106.12251v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2106.12251v2-abstract-full" style="display: none;"> A joint determination of the reactor antineutrino spectra resulting from the fission of $^{235}$U and $^{239}$Pu has been carried out by the Daya Bay and PROSPECT collaborations. This Letter reports the level of consistency of $^{235}$U spectrum measurements from the two experiments and presents new results from a joint analysis of both data sets. The measurements are found to be consistent. The combined analysis reduces the degeneracy between the dominant $^{235}$U and $^{239}$Pu isotopes and improves the uncertainty of the $^{235}$U spectral shape to about 3\%. The ${}^{235}$U and $^{239}$Pu antineutrino energy spectra are unfolded from the jointly deconvolved reactor spectra using the Wiener-SVD unfolding method, providing a data-based reference for other reactor antineutrino experiments and other applications. This is the first measurement of the $^{235}$U and $^{239}$Pu spectra based on the combination of experiments at low- and highly enriched uranium reactors. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.12251v2-abstract-full').style.display = 'none'; document.getElementById('2106.12251v2-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 February, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 June, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2021. </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">8 pages, 5 figures, Supplementary Material Included</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review Letters 128, 081801 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2103.04024">arXiv:2103.04024</a> <span> [<a href="https://arxiv.org/pdf/2103.04024">pdf</a>, <a href="https://arxiv.org/ps/2103.04024">ps</a>, <a href="https://arxiv.org/format/2103.04024">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="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/10.1038/s41586-021-03282-z">10.1038/s41586-021-03282-z <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Asymmetry of Antimatter in the Proton </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Dove%2C+J">J. Dove</a>, <a href="/search/nucl-ex?searchtype=author&query=Kerns%2C+B">B. Kerns</a>, <a href="/search/nucl-ex?searchtype=author&query=McClellan%2C+R+E">R. E. McClellan</a>, <a href="/search/nucl-ex?searchtype=author&query=Miyasaka%2C+S">S. Miyasaka</a>, <a href="/search/nucl-ex?searchtype=author&query=Morton%2C+D+H">D. H. Morton</a>, <a href="/search/nucl-ex?searchtype=author&query=Nagai%2C+K">K. Nagai</a>, <a href="/search/nucl-ex?searchtype=author&query=Prasad%2C+S">S. Prasad</a>, <a href="/search/nucl-ex?searchtype=author&query=Sanftl%2C+F">F. Sanftl</a>, <a href="/search/nucl-ex?searchtype=author&query=Scott%2C+M+B+C">M. B. C. Scott</a>, <a href="/search/nucl-ex?searchtype=author&query=Tadepalli%2C+A+S">A. S. Tadepalli</a>, <a href="/search/nucl-ex?searchtype=author&query=Aidala%2C+C+A">C. A. Aidala</a>, <a href="/search/nucl-ex?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Ayuso%2C+C">C. Ayuso</a>, <a href="/search/nucl-ex?searchtype=author&query=Barker%2C+C+L">C. L. Barker</a>, <a href="/search/nucl-ex?searchtype=author&query=Brown%2C+C+N">C. N. Brown</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+W+C">W. C. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+A">A. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Christian%2C+D+C">D. C. Christian</a>, <a href="/search/nucl-ex?searchtype=author&query=Dannowitz%2C+B+P">B. P. Dannowitz</a>, <a href="/search/nucl-ex?searchtype=author&query=Daugherity%2C+M">M. Daugherity</a>, <a href="/search/nucl-ex?searchtype=author&query=Diefenthaler%2C+M">M. Diefenthaler</a>, <a href="/search/nucl-ex?searchtype=author&query=Fassi%2C+L+E">L. El Fassi</a>, <a href="/search/nucl-ex?searchtype=author&query=Geesaman%2C+D+F">D. F. Geesaman</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilman%2C+R">R. Gilman</a>, <a href="/search/nucl-ex?searchtype=author&query=Goto%2C+Y">Y. Goto</a> , et al. (42 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="2103.04024v1-abstract-short" style="display: inline;"> The fundamental building blocks of the proton, quarks and gluons, have been known for decades. However, we still have an incomplete theoretical and experimental understanding of how these particles and their dynamics give rise to the quantum bound state of the proton and its physical properties, such as for example its spin. The two up and the single down quarks that comprise the proton in the sim… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.04024v1-abstract-full').style.display = 'inline'; document.getElementById('2103.04024v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2103.04024v1-abstract-full" style="display: none;"> The fundamental building blocks of the proton, quarks and gluons, have been known for decades. However, we still have an incomplete theoretical and experimental understanding of how these particles and their dynamics give rise to the quantum bound state of the proton and its physical properties, such as for example its spin. The two up and the single down quarks that comprise the proton in the simplest picture account only for a few percent of the proton mass, the bulk of which is in the form of quark kinetic and potential energy and gluon energy from the strong force. An essential feature of this force, as described by quantum chromodynamics, is its ability to create matter-antimatter quark pairs inside the proton that exist only for a very short time. Their fleeting existence makes the antimatter quarks within protons difficult to study, but their existence is discernible in reactions where a matter-antimatter quark pair annihilates. In this picture of quark-antiquark creation by the strong force, the probability distributions as a function of momentum for the presence of up and down antimatter quarks should be nearly identical, since their masses are quite similar and small compared to the mass of the proton. In the present manuscript, we show evidence from muon pair production measurements that these distributions are significantly different, with more abundant down antimatter quarks than up antimatter quarks over a wide range of momentum. These results revive interest in several proposed mechanisms as the origin of this antimatter asymmetry in the proton that had been disfavored by the previous results and point to the future measurements that can distinguish between these mechanisms. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.04024v1-abstract-full').style.display = 'none'; document.getElementById('2103.04024v1-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> 5 March, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2021. </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, 5 figures, 5 tables; Matches published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-PUB-21-073-E </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature, 590, 561-565 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1908.00040">arXiv:1908.00040</a> <span> [<a href="https://arxiv.org/pdf/1908.00040">pdf</a>, <a href="https://arxiv.org/format/1908.00040">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"> Probing the flavor dependence of proton's light-quark sea in the SeaQuest experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Dove%2C+J">Jason Dove</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="1908.00040v1-abstract-short" style="display: inline;"> Surprisingly large flavor asymmetry of the light-quark sea in the proton was reported in deep-inelastic scattering and Drell-Yan experiments. The Bjorken-$x$ dependence of the $\bar{d}/\bar{u}$ ratio extracted from the Fermilab E866 experiment also revealed an intriguing drop at the highest values of $x$. The Fermilab E906/SeaQuest experiment was designed to measure $\bar{d}/\bar{u}$ with improved… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1908.00040v1-abstract-full').style.display = 'inline'; document.getElementById('1908.00040v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1908.00040v1-abstract-full" style="display: none;"> Surprisingly large flavor asymmetry of the light-quark sea in the proton was reported in deep-inelastic scattering and Drell-Yan experiments. The Bjorken-$x$ dependence of the $\bar{d}/\bar{u}$ ratio extracted from the Fermilab E866 experiment also revealed an intriguing drop at the highest values of $x$. The Fermilab E906/SeaQuest experiment was designed to measure $\bar{d}/\bar{u}$ with improved accuracy at high Bjorken-$x$. By detecting high-mass dimuon events produced in the interaction of 120 GeV proton beam with liquid hydrogen (LH$_2$) and deuterium (LD$_2$) targets, the SeaQuest experiment probes the $\bar{d}/\bar{u}$ ratio up to $x \approx 0.45$. Data collection has been completed and we report the status of data analysis for SeaQuest. Two different methods for extracting the LD$_2$/LH$_2$ Drell-Yan cross section ratios for $0.1\leq x\leq 0.45$ are discussed. These ratios are compared with calculations using various PDFs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1908.00040v1-abstract-full').style.display = 'none'; document.getElementById('1908.00040v1-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> 31 July, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 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, 6 figures, DIS 2019 conference</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1706.09990">arXiv:1706.09990</a> <span> [<a href="https://arxiv.org/pdf/1706.09990">pdf</a>, <a href="https://arxiv.org/format/1706.09990">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> <p class="title is-5 mathjax"> The SeaQuest Spectrometer at Fermilab </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=SeaQuest+Collaboration"> SeaQuest Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=Aidala%2C+C+A">C. A. Aidala</a>, <a href="/search/nucl-ex?searchtype=author&query=Arrington%2C+J+R">J. R. Arrington</a>, <a href="/search/nucl-ex?searchtype=author&query=Ayuso%2C+C">C. Ayuso</a>, <a href="/search/nucl-ex?searchtype=author&query=Bowen%2C+B+M">B. M. Bowen</a>, <a href="/search/nucl-ex?searchtype=author&query=Bowen%2C+M+L">M. L. Bowen</a>, <a href="/search/nucl-ex?searchtype=author&query=Bowling%2C+K+L">K. L. Bowling</a>, <a href="/search/nucl-ex?searchtype=author&query=Brown%2C+A+W">A. W. Brown</a>, <a href="/search/nucl-ex?searchtype=author&query=Brown%2C+C+N">C. N. Brown</a>, <a href="/search/nucl-ex?searchtype=author&query=Byrd%2C+R">R. Byrd</a>, <a href="/search/nucl-ex?searchtype=author&query=Carlisle%2C+R+E">R. E. Carlisle</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+T">T. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+W+-">W. -C. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+A">A. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+J+-">J. -Y. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Christian%2C+D+C">D. C. Christian</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+X">X. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Dannowitz%2C+B+P">B. P. Dannowitz</a>, <a href="/search/nucl-ex?searchtype=author&query=Daugherity%2C+M">M. Daugherity</a>, <a href="/search/nucl-ex?searchtype=author&query=Diefenthaler%2C+M">M. Diefenthaler</a>, <a href="/search/nucl-ex?searchtype=author&query=Dove%2C+J">J. Dove</a>, <a href="/search/nucl-ex?searchtype=author&query=Durandet%2C+C">C. Durandet</a>, <a href="/search/nucl-ex?searchtype=author&query=Fassi%2C+L+E">L. El Fassi</a>, <a href="/search/nucl-ex?searchtype=author&query=Erdos%2C+E">E. Erdos</a>, <a href="/search/nucl-ex?searchtype=author&query=Fox%2C+D+M">D. M. Fox</a> , et al. (73 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="1706.09990v2-abstract-short" style="display: inline;"> The SeaQuest spectrometer at Fermilab was designed to detect oppositely-charged pairs of muons (dimuons) produced by interactions between a 120 GeV proton beam and liquid hydrogen, liquid deuterium and solid nuclear targets. The primary physics program uses the Drell-Yan process to probe antiquark distributions in the target nucleon. The spectrometer consists of a target system, two dipole magnets… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.09990v2-abstract-full').style.display = 'inline'; document.getElementById('1706.09990v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1706.09990v2-abstract-full" style="display: none;"> The SeaQuest spectrometer at Fermilab was designed to detect oppositely-charged pairs of muons (dimuons) produced by interactions between a 120 GeV proton beam and liquid hydrogen, liquid deuterium and solid nuclear targets. The primary physics program uses the Drell-Yan process to probe antiquark distributions in the target nucleon. The spectrometer consists of a target system, two dipole magnets and four detector stations. The upstream magnet is a closed-aperture solid iron magnet which also serves as the beam dump, while the second magnet is an open aperture magnet. Each of the detector stations consists of scintillator hodoscopes and a high-resolution tracking device. The FPGA-based trigger compares the hodoscope signals to a set of pre-programmed roads to determine if the event contains oppositely-signed, high-mass muon pairs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.09990v2-abstract-full').style.display = 'none'; document.getElementById('1706.09990v2-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> 9 February, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 June, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-PUB-17-209-E </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1704.01082">arXiv:1704.01082</a> <span> [<a href="https://arxiv.org/pdf/1704.01082">pdf</a>, <a href="https://arxiv.org/format/1704.01082">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> <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/10.1103/PhysRevLett.118.251801">10.1103/PhysRevLett.118.251801 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Evolution of the Reactor Antineutrino Flux and Spectrum at Daya Bay </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=An%2C+F+P">F. P. An</a>, <a href="/search/nucl-ex?searchtype=author&query=Balantekin%2C+A+B">A. B. Balantekin</a>, <a href="/search/nucl-ex?searchtype=author&query=Band%2C+H+R">H. R. Band</a>, <a href="/search/nucl-ex?searchtype=author&query=Bishai%2C+M">M. Bishai</a>, <a href="/search/nucl-ex?searchtype=author&query=Blyth%2C+S">S. Blyth</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+D">D. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+G+F">G. F. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+J">J. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y+L">Y. L. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+J+F">J. F. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+Y">Y. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+H+S">H. S. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+Q+Y">Q. Y. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+S+M">S. M. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+Y+X">Y. X. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+Y">Y. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Cheng%2C+J">J. Cheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Cheng%2C+Z+K">Z. K. Cheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Cherwinka%2C+J+J">J. J. Cherwinka</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+M+C">M. C. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Chukanov%2C+A">A. Chukanov</a>, <a href="/search/nucl-ex?searchtype=author&query=Cummings%2C+J+P">J. P. Cummings</a>, <a href="/search/nucl-ex?searchtype=author&query=Ding%2C+Y+Y">Y. Y. Ding</a>, <a href="/search/nucl-ex?searchtype=author&query=Diwan%2C+M+V">M. V. Diwan</a>, <a href="/search/nucl-ex?searchtype=author&query=Dolgareva%2C+M">M. Dolgareva</a> , et al. (180 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="1704.01082v2-abstract-short" style="display: inline;"> The Daya Bay experiment has observed correlations between reactor core fuel evolution and changes in the reactor antineutrino flux and energy spectrum. Four antineutrino detectors in two experimental halls were used to identify 2.2 million inverse beta decays (IBDs) over 1230 days spanning multiple fuel cycles for each of six 2.9 GW$_{\textrm{th}}$ reactor cores at the Daya Bay and Ling Ao nuclear… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1704.01082v2-abstract-full').style.display = 'inline'; document.getElementById('1704.01082v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1704.01082v2-abstract-full" style="display: none;"> The Daya Bay experiment has observed correlations between reactor core fuel evolution and changes in the reactor antineutrino flux and energy spectrum. Four antineutrino detectors in two experimental halls were used to identify 2.2 million inverse beta decays (IBDs) over 1230 days spanning multiple fuel cycles for each of six 2.9 GW$_{\textrm{th}}$ reactor cores at the Daya Bay and Ling Ao nuclear power plants. Using detector data spanning effective $^{239}$Pu fission fractions, $F_{239}$, from 0.25 to 0.35, Daya Bay measures an average IBD yield, $\bar蟽_f$, of $(5.90 \pm 0.13) \times 10^{-43}$ cm$^2$/fission and a fuel-dependent variation in the IBD yield, $d蟽_f/dF_{239}$, of $(-1.86 \pm 0.18) \times 10^{-43}$ cm$^2$/fission. This observation rejects the hypothesis of a constant antineutrino flux as a function of the $^{239}$Pu fission fraction at 10 standard deviations. The variation in IBD yield was found to be energy-dependent, rejecting the hypothesis of a constant antineutrino energy spectrum at 5.1 standard deviations. While measurements of the evolution in the IBD spectrum show general agreement with predictions from recent reactor models, the measured evolution in total IBD yield disagrees with recent predictions at 3.1$蟽$. This discrepancy indicates that an overall deficit in measured flux with respect to predictions does not result from equal fractional deficits from the primary fission isotopes $^{235}$U, $^{239}$Pu, $^{238}$U, and $^{241}$Pu. Based on measured IBD yield variations, yields of $(6.17 \pm 0.17)$ and $(4.27 \pm 0.26) \times 10^{-43}$ cm$^2$/fission have been determined for the two dominant fission parent isotopes $^{235}$U and $^{239}$Pu. A 7.8% discrepancy between the observed and predicted $^{235}$U yield suggests that this isotope may be the primary contributor to the reactor antineutrino anomaly. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1704.01082v2-abstract-full').style.display = 'none'; document.getElementById('1704.01082v2-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 June, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 April, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2017. </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">7 pages, 5 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. 118, 251801 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1610.04802">arXiv:1610.04802</a> <span> [<a href="https://arxiv.org/pdf/1610.04802">pdf</a>, <a href="https://arxiv.org/format/1610.04802">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> <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/10.1103/PhysRevD.95.072006">10.1103/PhysRevD.95.072006 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of electron antineutrino oscillation based on 1230 days of operation of the Daya Bay experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Daya+Bay+Collaboration"> Daya Bay Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=An%2C+F+P">F. P. An</a>, <a href="/search/nucl-ex?searchtype=author&query=Balantekin%2C+A+B">A. B. Balantekin</a>, <a href="/search/nucl-ex?searchtype=author&query=Band%2C+H+R">H. R. Band</a>, <a href="/search/nucl-ex?searchtype=author&query=Bishai%2C+M">M. Bishai</a>, <a href="/search/nucl-ex?searchtype=author&query=Blyth%2C+S">S. Blyth</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+D">D. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+G+F">G. F. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+J">J. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Cen%2C+W+R">W. R. Cen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y+L">Y. L. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+J+F">J. F. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+L+C">L. C. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+Y">Y. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+H+S">H. S. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+Q+Y">Q. Y. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+S+M">S. M. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+Y+X">Y. X. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+Y">Y. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Cheng%2C+J+-">J. -H. Cheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Cheng%2C+J">J. Cheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Cheng%2C+Y+P">Y. P. Cheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Cheng%2C+Z+K">Z. K. Cheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Cherwinka%2C+J+J">J. J. Cherwinka</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+M+C">M. C. Chu</a> , et al. (198 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="1610.04802v1-abstract-short" style="display: inline;"> A measurement of electron antineutrino oscillation by the Daya Bay Reactor Neutrino Experiment is described in detail. Six 2.9-GW$_{\rm th}$ nuclear power reactors of the Daya Bay and Ling Ao nuclear power facilities served as intense sources of $\overline谓_{e}$'s. Comparison of the $\overline谓_{e}$ rate and energy spectrum measured by antineutrino detectors far from the nuclear reactors (… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1610.04802v1-abstract-full').style.display = 'inline'; document.getElementById('1610.04802v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1610.04802v1-abstract-full" style="display: none;"> A measurement of electron antineutrino oscillation by the Daya Bay Reactor Neutrino Experiment is described in detail. Six 2.9-GW$_{\rm th}$ nuclear power reactors of the Daya Bay and Ling Ao nuclear power facilities served as intense sources of $\overline谓_{e}$'s. Comparison of the $\overline谓_{e}$ rate and energy spectrum measured by antineutrino detectors far from the nuclear reactors ($\sim$1500-1950 m) relative to detectors near the reactors ($\sim$350-600 m) allowed a precise measurement of $\overline谓_{e}$ disappearance. More than 2.5 million $\overline谓_{e}$ inverse beta decay interactions were observed, based on the combination of 217 days of operation of six antineutrino detectors (Dec. 2011--Jul. 2012) with a subsequent 1013 days using the complete configuration of eight detectors (Oct. 2012--Jul. 2015). The $\overline谓_{e}$ rate observed at the far detectors relative to the near detectors showed a significant deficit, $R=0.949 \pm 0.002(\mathrm{stat.}) \pm 0.002(\mathrm{syst.})$. The energy dependence of $\overline谓_{e}$ disappearance showed the distinct variation predicted by neutrino oscillation. Analysis using an approximation for the three-flavor oscillation probability yielded the flavor-mixing angle $\sin^22胃_{13}=0.0841 \pm 0.0027(\mathrm{stat.}) \pm 0.0019(\mathrm{syst.})$ and the effective neutrino mass-squared difference of $\left|螖m^2_{\mathrm{ee}}\right|=(2.50 \pm 0.06(\mathrm{stat.}) \pm 0.06(\mathrm{syst.})) \times 10^{-3}\ {\rm eV}^2$. Analysis using the exact three-flavor probability found $螖m^2_{32}=(2.45 \pm 0.06(\mathrm{stat.}) \pm 0.06(\mathrm{syst.})) \times 10^{-3}\ {\rm eV}^2$ assuming the normal neutrino mass hierarchy and $螖m^2_{32}=(-2.56 \pm 0.06(\mathrm{stat.}) \pm 0.06(\mathrm{syst.})) \times 10^{-3}\ {\rm eV}^2$ for the inverted hierarchy. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1610.04802v1-abstract-full').style.display = 'none'; document.getElementById('1610.04802v1-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> 15 October, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">44 pages, 44 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 95, 072006 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1607.05378">arXiv:1607.05378</a> <span> [<a href="https://arxiv.org/pdf/1607.05378">pdf</a>, <a href="https://arxiv.org/format/1607.05378">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> <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/10.1088/1674-1137/41/1/013002">10.1088/1674-1137/41/1/013002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Improved Measurement of the Reactor Antineutrino Flux and Spectrum at Daya Bay </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=An%2C+F+P">F. P. An</a>, <a href="/search/nucl-ex?searchtype=author&query=Balantekin%2C+A+B">A. B. Balantekin</a>, <a href="/search/nucl-ex?searchtype=author&query=Band%2C+H+R">H. R. Band</a>, <a href="/search/nucl-ex?searchtype=author&query=Bishai%2C+M">M. Bishai</a>, <a href="/search/nucl-ex?searchtype=author&query=Blyth%2C+S">S. Blyth</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+D">D. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+G+F">G. F. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+J">J. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Cen%2C+W+R">W. R. Cen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y+L">Y. L. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+J+F">J. F. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+L+C">L. C. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+Y">Y. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+H+S">H. S. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+Q+Y">Q. Y. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+S+M">S. M. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+Y+X">Y. X. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+Y">Y. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Cheng%2C+J+-">J. -H. Cheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Cheng%2C+J">J. Cheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Cheng%2C+Y+P">Y. P. Cheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Cheng%2C+Z+K">Z. K. Cheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Cherwinka%2C+J+J">J. J. Cherwinka</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+M+C">M. C. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Chukanov%2C+A">A. Chukanov</a> , et al. (197 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="1607.05378v2-abstract-short" style="display: inline;"> A new measurement of the reactor antineutrino flux and energy spectrum by the Daya Bay reactor neutrino experiment is reported. The antineutrinos were generated by six 2.9~GW$_{\mathrm{th}}$ nuclear reactors and detected by eight antineutrino detectors deployed in two near (560~m and 600~m flux-weighted baselines) and one far (1640~m flux-weighted baseline) underground experimental halls. With 621… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1607.05378v2-abstract-full').style.display = 'inline'; document.getElementById('1607.05378v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1607.05378v2-abstract-full" style="display: none;"> A new measurement of the reactor antineutrino flux and energy spectrum by the Daya Bay reactor neutrino experiment is reported. The antineutrinos were generated by six 2.9~GW$_{\mathrm{th}}$ nuclear reactors and detected by eight antineutrino detectors deployed in two near (560~m and 600~m flux-weighted baselines) and one far (1640~m flux-weighted baseline) underground experimental halls. With 621 days of data, more than 1.2 million inverse beta decay (IBD) candidates were detected. The IBD yield in the eight detectors was measured, and the ratio of measured to predicted flux was found to be $0.946\pm0.020$ ($0.992\pm0.021$) for the Huber+Mueller (ILL+Vogel) model. A 2.9~$蟽$ deviation was found in the measured IBD positron energy spectrum compared to the predictions. In particular, an excess of events in the region of 4-6~MeV was found in the measured spectrum, with a local significance of 4.4~$蟽$. A reactor antineutrino spectrum weighted by the IBD cross section is extracted for model-independent predictions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1607.05378v2-abstract-full').style.display = 'none'; document.getElementById('1607.05378v2-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> 9 January, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 July, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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 published in Chinese Physics C</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Chinese Physics C, 2017, 41(1): 13002-013002 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1508.04233">arXiv:1508.04233</a> <span> [<a href="https://arxiv.org/pdf/1508.04233">pdf</a>, <a href="https://arxiv.org/format/1508.04233">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> <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/10.1103/PhysRevLett.116.061801">10.1103/PhysRevLett.116.061801 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the Reactor Antineutrino Flux and Spectrum at Daya Bay </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Daya+Bay+Collaboration"> Daya Bay Collaboration</a>, <a href="/search/nucl-ex?searchtype=author&query=An%2C+F+P">F. P. An</a>, <a href="/search/nucl-ex?searchtype=author&query=Balantekin%2C+A+B">A. B. Balantekin</a>, <a href="/search/nucl-ex?searchtype=author&query=Band%2C+H+R">H. R. Band</a>, <a href="/search/nucl-ex?searchtype=author&query=Bishai%2C+M">M. Bishai</a>, <a href="/search/nucl-ex?searchtype=author&query=Blyth%2C+S">S. Blyth</a>, <a href="/search/nucl-ex?searchtype=author&query=Butorov%2C+I">I. Butorov</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+D">D. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+G+F">G. F. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Cao%2C+J">J. Cao</a>, <a href="/search/nucl-ex?searchtype=author&query=Cen%2C+W+R">W. R. Cen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chan%2C+Y+L">Y. L. Chan</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+J+F">J. F. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+L+C">L. C. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chang%2C+Y">Y. Chang</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+H+S">H. S. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+Q+Y">Q. Y. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+S+M">S. M. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+Y+X">Y. X. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Chen%2C+Y">Y. Chen</a>, <a href="/search/nucl-ex?searchtype=author&query=Cheng%2C+J+H">J. H. Cheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Cheng%2C+J">J. Cheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Cheng%2C+Y+P">Y. P. Cheng</a>, <a href="/search/nucl-ex?searchtype=author&query=Cherwinka%2C+J+J">J. J. Cherwinka</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+M+C">M. C. Chu</a> , et al. (200 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="1508.04233v1-abstract-short" style="display: inline;"> This Letter reports a measurement of the flux and energy spectrum of electron antineutrinos from six 2.9~GW$_{th}$ nuclear reactors with six detectors deployed in two near (effective baselines 512~m and 561~m) and one far (1,579~m) underground experimental halls in the Daya Bay experiment. Using 217 days of data, 296,721 and 41,589 inverse beta decay (IBD) candidates were detected in the near and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1508.04233v1-abstract-full').style.display = 'inline'; document.getElementById('1508.04233v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1508.04233v1-abstract-full" style="display: none;"> This Letter reports a measurement of the flux and energy spectrum of electron antineutrinos from six 2.9~GW$_{th}$ nuclear reactors with six detectors deployed in two near (effective baselines 512~m and 561~m) and one far (1,579~m) underground experimental halls in the Daya Bay experiment. Using 217 days of data, 296,721 and 41,589 inverse beta decay (IBD) candidates were detected in the near and far halls, respectively. The measured IBD yield is (1.55 $\pm$ 0.04) $\times$ 10$^{-18}$~cm$^2$/GW/day or (5.92 $\pm$ 0.14) $\times$ 10$^{-43}$~cm$^2$/fission. This flux measurement is consistent with previous short-baseline reactor antineutrino experiments and is $0.946\pm0.022$ ($0.991\pm0.023$) relative to the flux predicted with the Huber+Mueller (ILL+Vogel) fissile antineutrino model. The measured IBD positron energy spectrum deviates from both spectral predictions by more than 2$蟽$ over the full energy range with a local significance of up to $\sim$4$蟽$ between 4-6 MeV. A reactor antineutrino spectrum of IBD reactions is extracted from the measured positron energy spectrum for model-independent predictions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1508.04233v1-abstract-full').style.display = 'none'; document.getElementById('1508.04233v1-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 August, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 116, 061801 (2016) </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 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg> <a href="https://info.arxiv.org/help/contact.html"> Contact</a> </li> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>subscribe to arXiv mailings</title><desc>Click here to subscribe</desc><path d="M476 3.2L12.5 270.6c-18.1 10.4-15.8 35.6 2.2 43.2L121 358.4l287.3-253.2c5.5-4.9 13.3 2.6 8.6 8.3L176 407v80.5c0 23.6 28.5 32.9 42.5 15.8L282 426l124.6 52.2c14.2 6 30.4-2.9 33-18.2l72-432C515 7.8 493.3-6.8 476 3.2z"/></svg> <a href="https://info.arxiv.org/help/subscribe"> Subscribe</a> </li> </ul> </div> </div> </div>   <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/license/index.html">Copyright</a></li> <li><a href="https://info.arxiv.org/help/policies/privacy_policy.html">Privacy Policy</a></li> </ul> </div> <div class="column sorry-app-links"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/web_accessibility.html">Web Accessibility Assistance</a></li> <li> <p class="help"> <a class="a11y-main-link" href="https://status.arxiv.org" target="_blank">arXiv Operational Status <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 512" class="icon filter-dark_grey" role="presentation"><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"/></svg></a><br> Get status notifications via <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/email/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg>email</a> or <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/slack/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" class="icon filter-black" role="presentation"><path d="M94.12 315.1c0 25.9-21.16 47.06-47.06 47.06S0 341 0 315.1c0-25.9 21.16-47.06 47.06-47.06h47.06v47.06zm23.72 0c0-25.9 21.16-47.06 47.06-47.06s47.06 21.16 47.06 47.06v117.84c0 25.9-21.16 47.06-47.06 47.06s-47.06-21.16-47.06-47.06V315.1zm47.06-188.98c-25.9 0-47.06-21.16-47.06-47.06S139 32 164.9 32s47.06 21.16 47.06 47.06v47.06H164.9zm0 23.72c25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06H47.06C21.16 243.96 0 222.8 0 196.9s21.16-47.06 47.06-47.06H164.9zm188.98 47.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06h-47.06V196.9zm-23.72 0c0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06V79.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06V196.9zM283.1 385.88c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06v-47.06h47.06zm0-23.72c-25.9 0-47.06-21.16-47.06-47.06 0-25.9 21.16-47.06 47.06-47.06h117.84c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06H283.1z"/></svg>slack</a> </p> </li> </ul> </div> </div> </div>  </div> </footer> <script src="https://static.arxiv.org/static/base/1.0.0a5/js/member_acknowledgement.js"></script> </body> </html>

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