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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/2406.18738">arXiv:2406.18738</a> <span> [<a href="https://arxiv.org/pdf/2406.18738">pdf</a>, <a href="https://arxiv.org/ps/2406.18738">ps</a>, <a href="https://arxiv.org/format/2406.18738">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> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> </div> <p class="title is-5 mathjax"> New Spin Structure Constraints on Hyperfine Splitting and Proton Size </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ruth%2C+D">David Ruth</a>, <a href="/search/physics?searchtype=author&query=Slifer%2C+K">Karl Slifer</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+J">Jian-Ping Chen</a>, <a href="/search/physics?searchtype=author&query=Carlson%2C+C+E">Carl E. Carlson</a>, <a href="/search/physics?searchtype=author&query=Hagelstein%2C+F">Franziska Hagelstein</a>, <a href="/search/physics?searchtype=author&query=Pascalutsa%2C+V">Vladimir Pascalutsa</a>, <a href="/search/physics?searchtype=author&query=Deur%2C+A">Alexandre Deur</a>, <a href="/search/physics?searchtype=author&query=Kuhn%2C+S">Sebastian Kuhn</a>, <a href="/search/physics?searchtype=author&query=Ripani%2C+M">Marco Ripani</a>, <a href="/search/physics?searchtype=author&query=Zheng%2C+X">Xiaochao Zheng</a>, <a href="/search/physics?searchtype=author&query=Zielinski%2C+R">Ryan Zielinski</a>, <a href="/search/physics?searchtype=author&query=Gu%2C+C">Chao Gu</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="2406.18738v2-abstract-short" style="display: inline;"> The 1S hyperfine splitting in hydrogen is measured to an impressive ppt precision and will soon be measured to ppm precision in muonic hydrogen. The latter measurement will rely on theoretical predictions, which are limited by knowledge of the proton polarizability effect $螖_\text{pol}$. Data-driven evaluations of $螖_\text{pol}$ have long been in significant tension with baryon chiral perturbation… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.18738v2-abstract-full').style.display = 'inline'; document.getElementById('2406.18738v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.18738v2-abstract-full" style="display: none;"> The 1S hyperfine splitting in hydrogen is measured to an impressive ppt precision and will soon be measured to ppm precision in muonic hydrogen. The latter measurement will rely on theoretical predictions, which are limited by knowledge of the proton polarizability effect $螖_\text{pol}$. Data-driven evaluations of $螖_\text{pol}$ have long been in significant tension with baryon chiral perturbation theory. Here we present improved results for $螖_\text{pol}$ driven by new spin structure data, reducing the long-standing tension between theory and experiment and halving the dominating uncertainty in hyperfine splitting calculations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.18738v2-abstract-full').style.display = 'none'; document.getElementById('2406.18738v2-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> 3 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 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/2405.06002">arXiv:2405.06002</a> <span> [<a href="https://arxiv.org/pdf/2405.06002">pdf</a>, <a href="https://arxiv.org/format/2405.06002">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Physics">physics.gen-ph</span> </div> </div> <p class="title is-5 mathjax"> Poincar茅 invariance, the Unruh effect, and black hole evaporation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Deur%2C+A">Alexandre Deur</a>, <a href="/search/physics?searchtype=author&query=Brodsky%2C+S+J">Stanley J. Brodsky</a>, <a href="/search/physics?searchtype=author&query=Roberts%2C+C+D">Craig D. Roberts</a>, <a href="/search/physics?searchtype=author&query=Terzi%C4%87%2C+B">Bal拧a Terzi膰</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="2405.06002v1-abstract-short" style="display: inline;"> In quantum field theory, the vacuum is widely considered to be a complex medium populated with virtual particle + antiparticle pairs. To an observer experiencing uniform acceleration, it is generally held that these virtual particles become real, appearing as a gas at a temperature which grows with the acceleration. This is the Unruh effect. However, it can be shown that vacuum complexity is an ar… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.06002v1-abstract-full').style.display = 'inline'; document.getElementById('2405.06002v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2405.06002v1-abstract-full" style="display: none;"> In quantum field theory, the vacuum is widely considered to be a complex medium populated with virtual particle + antiparticle pairs. To an observer experiencing uniform acceleration, it is generally held that these virtual particles become real, appearing as a gas at a temperature which grows with the acceleration. This is the Unruh effect. However, it can be shown that vacuum complexity is an artifact, produced by treating quantum field theory in a manner that does not manifestly enforce causality. Choosing a quantization approach that patently enforces causality, the quantum field theory vacuum is barren, bereft even of virtual particles. We show that acceleration has no effect on a trivial vacuum; hence, there is no Unruh effect in such a treatment of quantum field theory. Since the standard calculations suggesting an Unruh effect are formally consistent, insofar as they have been completed, there must be a cancelling contribution that is omitted in the usual analyses. We argue that it is the dynamical action of conventional Lorentz transformations on the structure of an Unruh detector. Given the equivalence principle, an Unruh effect would correspond to black hole radiation. Thus, our perspective has significant consequences for quantum gravity and black hole physics: no Unruh effect entails the absence of black hole radiation evaporation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.06002v1-abstract-full').style.display = 'none'; document.getElementById('2405.06002v1-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 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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">17 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-24-4003, SLAC-PUB-17762, NJU-INP 088/24 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2208.05054">arXiv:2208.05054</a> <span> [<a href="https://arxiv.org/pdf/2208.05054">pdf</a>, <a href="https://arxiv.org/format/2208.05054">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="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.nima.2023.168032">10.1016/j.nima.2023.168032 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Alignment of the CLAS12 central hybrid tracker with a Kalman Filter </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Paul%2C+S+J">S. J. Paul</a>, <a href="/search/physics?searchtype=author&query=Peck%2C+A">A. Peck</a>, <a href="/search/physics?searchtype=author&query=Arratia%2C+M">M. Arratia</a>, <a href="/search/physics?searchtype=author&query=Gotra%2C+Y">Y. Gotra</a>, <a href="/search/physics?searchtype=author&query=Ziegler%2C+V">V. Ziegler</a>, <a href="/search/physics?searchtype=author&query=De+Vita%2C+R">R. De Vita</a>, <a href="/search/physics?searchtype=author&query=Bossu%2C+F">F. Bossu</a>, <a href="/search/physics?searchtype=author&query=Defurne%2C+M">M. Defurne</a>, <a href="/search/physics?searchtype=author&query=Atac%2C+H">H. Atac</a>, <a href="/search/physics?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/physics?searchtype=author&query=Baashen%2C+L">L. Baashen</a>, <a href="/search/physics?searchtype=author&query=Baltzell%2C+N+A">N. A. Baltzell</a>, <a href="/search/physics?searchtype=author&query=Barion%2C+L">L. Barion</a>, <a href="/search/physics?searchtype=author&query=Bashkanov%2C+M">M. Bashkanov</a>, <a href="/search/physics?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/physics?searchtype=author&query=Bedlinskiy%2C+I">I. Bedlinskiy</a>, <a href="/search/physics?searchtype=author&query=Benkel%2C+B">B. Benkel</a>, <a href="/search/physics?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/physics?searchtype=author&query=Bianconi%2C+A">A. Bianconi</a>, <a href="/search/physics?searchtype=author&query=Biondo%2C+L">L. Biondo</a>, <a href="/search/physics?searchtype=author&query=Biselli%2C+A+S">A. S. Biselli</a>, <a href="/search/physics?searchtype=author&query=Bondi%2C+M">M. Bondi</a>, <a href="/search/physics?searchtype=author&query=Boiarinov%2C+S">S. Boiarinov</a>, <a href="/search/physics?searchtype=author&query=Brinkmann%2C+K+T">K. Th. Brinkmann</a>, <a href="/search/physics?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a> , et al. (109 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="2208.05054v1-abstract-short" style="display: inline;"> Several factors can contribute to the difficulty of aligning the sensors of tracking detectors, including a large number of modules, multiple types of detector technologies, and non-linear strip patterns on the sensors. All three of these factors apply to the CLAS12 CVT, which is a hybrid detector consisting of planar silicon sensors with non-parallel strips, and cylindrical micromegas sensors wit… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.05054v1-abstract-full').style.display = 'inline'; document.getElementById('2208.05054v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2208.05054v1-abstract-full" style="display: none;"> Several factors can contribute to the difficulty of aligning the sensors of tracking detectors, including a large number of modules, multiple types of detector technologies, and non-linear strip patterns on the sensors. All three of these factors apply to the CLAS12 CVT, which is a hybrid detector consisting of planar silicon sensors with non-parallel strips, and cylindrical micromegas sensors with longitudinal and arc-shaped strips located within a 5~T superconducting solenoid. To align this detector, we used the Kalman Alignment Algorithm, which accounts for correlations between the alignment parameters without requiring the time-consuming inversion of large matrices. This is the first time that this algorithm has been adapted for use with hybrid technologies, non-parallel strips, and curved sensors. We present the results for the first alignment of the CLAS12 CVT using straight tracks from cosmic rays and from a target with the magnetic field turned off. After running this procedure, we achieved alignment at the level of 10~$渭$m, and the widths of the residual spectra were greatly reduced. These results attest to the flexibility of this algorithm and its applicability to future use in the CLAS12 CVT and other hybrid or curved trackers, such as those proposed for the future Electron-Ion Collider. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.05054v1-abstract-full').style.display = 'none'; document.getElementById('2208.05054v1-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 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">Journal ref:</span> Nucl.Instrum.Meth.A 1049 (2023) 168032 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2108.04649">arXiv:2108.04649</a> <span> [<a href="https://arxiv.org/pdf/2108.04649">pdf</a>, <a href="https://arxiv.org/format/2108.04649">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Physics">physics.gen-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Cosmology and Nongalactic Astrophysics">astro-ph.CO</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</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.2021.136510">10.1016/j.physletb.2021.136510 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Effect of gravitational field self-interaction on large structure formation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Deur%2C+A">Alexandre Deur</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="2108.04649v1-abstract-short" style="display: inline;"> We check whether General Relativity's field self-interaction alleviates the need for dark matter to explain the universe's large structure formation. We found that self-interaction accelerates sufficiently the growth of structures so that they can reach their presently observed density. No free parameters, dark components or modifications of the known laws of nature were required. This result adds… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.04649v1-abstract-full').style.display = 'inline'; document.getElementById('2108.04649v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2108.04649v1-abstract-full" style="display: none;"> We check whether General Relativity's field self-interaction alleviates the need for dark matter to explain the universe's large structure formation. We found that self-interaction accelerates sufficiently the growth of structures so that they can reach their presently observed density. No free parameters, dark components or modifications of the known laws of nature were required. This result adds to the other natural explanations provided by the same approach to the, $inter~alia$, flat rotation curves of galaxies, supernovae observations suggestive of dark energy, and dynamics of galaxy clusters, thereby reinforcing its credibility as an alternative to the dark universe model. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.04649v1-abstract-full').style.display = 'none'; document.getElementById('2108.04649v1-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 July, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 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">6 pages, 2 figures. Accepted for publication in Phys. Lett. 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/2103.01749">arXiv:2103.01749</a> <span> [<a href="https://arxiv.org/pdf/2103.01749">pdf</a>, <a href="https://arxiv.org/format/2103.01749">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.2021.165300">10.1016/j.nima.2021.165300 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The PRad Windowless Gas Flow Target </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Pierce%2C+J">J. Pierce</a>, <a href="/search/physics?searchtype=author&query=Brock%2C+J">J. Brock</a>, <a href="/search/physics?searchtype=author&query=Carlin%2C+C">C. Carlin</a>, <a href="/search/physics?searchtype=author&query=Keith%2C+C">C. Keith</a>, <a href="/search/physics?searchtype=author&query=Maxwell%2C+J">J. Maxwell</a>, <a href="/search/physics?searchtype=author&query=Meekins%2C+D">D. Meekins</a>, <a href="/search/physics?searchtype=author&query=Bai%2C+X">X. Bai</a>, <a href="/search/physics?searchtype=author&query=Deur%2C+A">A. Deur</a>, <a href="/search/physics?searchtype=author&query=Dutta%2C+D">D. Dutta</a>, <a href="/search/physics?searchtype=author&query=Gao%2C+H">H. Gao</a>, <a href="/search/physics?searchtype=author&query=Gasparian%2C+A">A. Gasparian</a>, <a href="/search/physics?searchtype=author&query=Gnanvo%2C+K">K. Gnanvo</a>, <a href="/search/physics?searchtype=author&query=Gu%2C+C">C. Gu</a>, <a href="/search/physics?searchtype=author&query=Higinbotham%2C+D">D. Higinbotham</a>, <a href="/search/physics?searchtype=author&query=Khandaker%2C+M">M. Khandaker</a>, <a href="/search/physics?searchtype=author&query=Liyanage%2C+N">N. Liyanage</a>, <a href="/search/physics?searchtype=author&query=Meziane%2C+M">M. Meziane</a>, <a href="/search/physics?searchtype=author&query=Pasyuk%2C+E">E. Pasyuk</a>, <a href="/search/physics?searchtype=author&query=Peng%2C+C">C. Peng</a>, <a href="/search/physics?searchtype=author&query=Punjabi%2C+V">V. Punjabi</a>, <a href="/search/physics?searchtype=author&query=Xiong%2C+W">W. Xiong</a>, <a href="/search/physics?searchtype=author&query=Yan%2C+X">X. Yan</a>, <a href="/search/physics?searchtype=author&query=Ye%2C+L">L. Ye</a>, <a href="/search/physics?searchtype=author&query=Zhang%2C+Y">Y Zhang</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="2103.01749v1-abstract-short" style="display: inline;"> We report on a windowless, high-density, gas flow target at Jefferson Lab that was used to measure $r_p$, the root-mean-square charge radius of the proton. To our knowledge, this is the first such system used in a fixed-target experiment at a (non-storage ring) electron accelerator. The target achieved its design goal of an areal density of 2$\times$10$^{18}$ atoms/cm$^2$, with the gas uniformly d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.01749v1-abstract-full').style.display = 'inline'; document.getElementById('2103.01749v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2103.01749v1-abstract-full" style="display: none;"> We report on a windowless, high-density, gas flow target at Jefferson Lab that was used to measure $r_p$, the root-mean-square charge radius of the proton. To our knowledge, this is the first such system used in a fixed-target experiment at a (non-storage ring) electron accelerator. The target achieved its design goal of an areal density of 2$\times$10$^{18}$ atoms/cm$^2$, with the gas uniformly distributed over the 4 cm length of the cell and less than 1% residual gas outside the cell. This design eliminated scattering from the end caps of the target cell, a problem endemic to previous measurements of the proton charge radius in electron scattering experiments, and permitted a precise, model-independent extraction of $r_p$ by reaching unprecedentedly low values of $Q^2$, the square of the electron's transfer of four-momentum to the proton. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.01749v1-abstract-full').style.display = 'none'; document.getElementById('2103.01749v1-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 March, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2005.14272">arXiv:2005.14272</a> <span> [<a href="https://arxiv.org/pdf/2005.14272">pdf</a>, <a href="https://arxiv.org/format/2005.14272">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.2020.164807">10.1016/j.nima.2020.164807 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The GlueX Beamline and Detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Adhikari%2C+S">S. Adhikari</a>, <a href="/search/physics?searchtype=author&query=Akondi%2C+C+S">C. S. Akondi</a>, <a href="/search/physics?searchtype=author&query=Ghoul%2C+H+A">H. Al Ghoul</a>, <a href="/search/physics?searchtype=author&query=Ali%2C+A">A. Ali</a>, <a href="/search/physics?searchtype=author&query=Amaryan%2C+M">M. Amaryan</a>, <a href="/search/physics?searchtype=author&query=Anassontzis%2C+E+G">E. G. Anassontzis</a>, <a href="/search/physics?searchtype=author&query=Austregesilo%2C+A">A. Austregesilo</a>, <a href="/search/physics?searchtype=author&query=Barbosa%2C+F">F. Barbosa</a>, <a href="/search/physics?searchtype=author&query=Barlow%2C+J">J. Barlow</a>, <a href="/search/physics?searchtype=author&query=Barnes%2C+A">A. Barnes</a>, <a href="/search/physics?searchtype=author&query=Barriga%2C+E">E. Barriga</a>, <a href="/search/physics?searchtype=author&query=Barsotti%2C+R">R. Barsotti</a>, <a href="/search/physics?searchtype=author&query=Beattie%2C+T+D">T. D. Beattie</a>, <a href="/search/physics?searchtype=author&query=Benesch%2C+J">J. Benesch</a>, <a href="/search/physics?searchtype=author&query=Berdnikov%2C+V+V">V. V. Berdnikov</a>, <a href="/search/physics?searchtype=author&query=Biallas%2C+G">G. Biallas</a>, <a href="/search/physics?searchtype=author&query=Black%2C+T">T. Black</a>, <a href="/search/physics?searchtype=author&query=Boeglin%2C+W">W. Boeglin</a>, <a href="/search/physics?searchtype=author&query=Brindza%2C+P">P. Brindza</a>, <a href="/search/physics?searchtype=author&query=Briscoe%2C+W+J">W. J. Briscoe</a>, <a href="/search/physics?searchtype=author&query=Britton%2C+T">T. Britton</a>, <a href="/search/physics?searchtype=author&query=Brock%2C+J">J. Brock</a>, <a href="/search/physics?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/physics?searchtype=author&query=Cannon%2C+B+E">B. E. Cannon</a>, <a href="/search/physics?searchtype=author&query=Carlin%2C+C">C. Carlin</a> , et al. (165 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="2005.14272v2-abstract-short" style="display: inline;"> The GlueX experiment at Jefferson Lab has been designed to study photoproduction reactions with a 9-GeV linearly polarized photon beam. The energy and arrival time of beam photons are tagged using a scintillator hodoscope and a scintillating fiber array. The photon flux is determined using a pair spectrometer, while the linear polarization of the photon beam is determined using a polarimeter based… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.14272v2-abstract-full').style.display = 'inline'; document.getElementById('2005.14272v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2005.14272v2-abstract-full" style="display: none;"> The GlueX experiment at Jefferson Lab has been designed to study photoproduction reactions with a 9-GeV linearly polarized photon beam. The energy and arrival time of beam photons are tagged using a scintillator hodoscope and a scintillating fiber array. The photon flux is determined using a pair spectrometer, while the linear polarization of the photon beam is determined using a polarimeter based on triplet photoproduction. Charged-particle tracks from interactions in the central target are analyzed in a solenoidal field using a central straw-tube drift chamber and six packages of planar chambers with cathode strips and drift wires. Electromagnetic showers are reconstructed in a cylindrical scintillating fiber calorimeter inside the magnet and a lead-glass array downstream. Charged particle identification is achieved by measuring energy loss in the wire chambers and using the flight time of particles between the target and detectors outside the magnet. The signals from all detectors are recorded with flash ADCs and/or pipeline TDCs into memories allowing trigger decisions with a latency of 3.3 $渭$s. The detector operates routinely at trigger rates of 40 kHz and data rates of 600 megabytes per second. We describe the photon beam, the GlueX detector components, electronics, data-acquisition and monitoring systems, and the performance of the experiment during the first three years of operation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.14272v2-abstract-full').style.display = 'none'; document.getElementById('2005.14272v2-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 October, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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">Accepted by Nuclear Instruments and Methods A, 78 pages, 54 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-20-3195 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl. Instrum. & Meth. A987, 164807 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1901.04548">arXiv:1901.04548</a> <span> [<a href="https://arxiv.org/pdf/1901.04548">pdf</a>, <a href="https://arxiv.org/format/1901.04548">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.2015.12.063">10.1016/j.nima.2015.12.063 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A cryostat to hold frozen-spin polarized HD targets in CLAS: HDice-II </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Lowry%2C+M+M">M. M. Lowry</a>, <a href="/search/physics?searchtype=author&query=Bass%2C+C+D">C. D. Bass</a>, <a href="/search/physics?searchtype=author&query=D%27Angelo%2C+A">A. D'Angelo</a>, <a href="/search/physics?searchtype=author&query=Deur%2C+A">A. Deur</a>, <a href="/search/physics?searchtype=author&query=Dezern%2C+G">G. Dezern</a>, <a href="/search/physics?searchtype=author&query=Hanretty%2C+C">C. Hanretty</a>, <a href="/search/physics?searchtype=author&query=Ho%2C+D">D. Ho</a>, <a href="/search/physics?searchtype=author&query=Kageya%2C+T">T. Kageya</a>, <a href="/search/physics?searchtype=author&query=Kashy%2C+D">D. Kashy</a>, <a href="/search/physics?searchtype=author&query=Khandaker%2C+M">M. Khandaker</a>, <a href="/search/physics?searchtype=author&query=Laine%2C+V">V. Laine</a>, <a href="/search/physics?searchtype=author&query=O%27Connell%2C+T">T. O'Connell</a>, <a href="/search/physics?searchtype=author&query=Pastor%2C+O">O. Pastor</a>, <a href="/search/physics?searchtype=author&query=Peng%2C+P">P. Peng</a>, <a href="/search/physics?searchtype=author&query=Sandorfi%2C+A+M">A. M. Sandorfi</a>, <a href="/search/physics?searchtype=author&query=Sokhan%2C+D">D. Sokhan</a>, <a href="/search/physics?searchtype=author&query=Wei%2C+X">X. Wei</a>, <a href="/search/physics?searchtype=author&query=Zarecky%2C+M">M. Zarecky</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="1901.04548v1-abstract-short" style="display: inline;"> The design, fabrication, operation, and performance of a helium-3/4 dilution refrigerator and superconducting magnet system for holding a frozen-spin polarized hydrogen deuteride target in the Jefferson Laboratory CLAS detector during photon beam running is reported. The device operates both vertically (for target loading) and horizontally (for target bombardment). The device proves capable of mai… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.04548v1-abstract-full').style.display = 'inline'; document.getElementById('1901.04548v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1901.04548v1-abstract-full" style="display: none;"> The design, fabrication, operation, and performance of a helium-3/4 dilution refrigerator and superconducting magnet system for holding a frozen-spin polarized hydrogen deuteride target in the Jefferson Laboratory CLAS detector during photon beam running is reported. The device operates both vertically (for target loading) and horizontally (for target bombardment). The device proves capable of maintaining a base temperature of 50 mK and a holding field of 1 Tesla for extended periods. These characteristics enabled multi-month polarization lifetimes for frozen spin HD targets having proton polarization of up to 50% and deuteron up to 27%. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.04548v1-abstract-full').style.display = 'none'; document.getElementById('1901.04548v1-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> 14 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> NIM A815 (2016) p31-41 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1711.09089">arXiv:1711.09089</a> <span> [<a href="https://arxiv.org/pdf/1711.09089">pdf</a>, <a href="https://arxiv.org/format/1711.09089">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.2017.12.008">10.1016/j.nima.2017.12.008 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Design and Performance of the Spin Asymmetries of the Nucleon Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Maxwell%2C+J+D">J. D. Maxwell</a>, <a href="/search/physics?searchtype=author&query=Armstrong%2C+W+R">W. R. Armstrong</a>, <a href="/search/physics?searchtype=author&query=Choi%2C+S">S. Choi</a>, <a href="/search/physics?searchtype=author&query=Jones%2C+M+K">M. K. Jones</a>, <a href="/search/physics?searchtype=author&query=Kang%2C+H">H. Kang</a>, <a href="/search/physics?searchtype=author&query=Liyanage%2C+A">A. Liyanage</a>, <a href="/search/physics?searchtype=author&query=Meziani%2C+Z+-">Z. -E. Meziani</a>, <a href="/search/physics?searchtype=author&query=Mulholland%2C+J">J. Mulholland</a>, <a href="/search/physics?searchtype=author&query=Ndukum%2C+L">L. Ndukum</a>, <a href="/search/physics?searchtype=author&query=Rondon%2C+O+A">O. A. Rondon</a>, <a href="/search/physics?searchtype=author&query=Ahmidouch%2C+A">A. Ahmidouch</a>, <a href="/search/physics?searchtype=author&query=Albayrak%2C+I">I. Albayrak</a>, <a href="/search/physics?searchtype=author&query=Asaturyan%2C+A">A. Asaturyan</a>, <a href="/search/physics?searchtype=author&query=Ates%2C+O">O. Ates</a>, <a href="/search/physics?searchtype=author&query=Baghdasaryan%2C+H">H. Baghdasaryan</a>, <a href="/search/physics?searchtype=author&query=Boeglin%2C+W">W. Boeglin</a>, <a href="/search/physics?searchtype=author&query=Bosted%2C+P">P. Bosted</a>, <a href="/search/physics?searchtype=author&query=Brash%2C+E">E. Brash</a>, <a href="/search/physics?searchtype=author&query=Brock%2C+J">J. Brock</a>, <a href="/search/physics?searchtype=author&query=Butuceanu%2C+C">C. Butuceanu</a>, <a href="/search/physics?searchtype=author&query=Bychkov%2C+M">M. Bychkov</a>, <a href="/search/physics?searchtype=author&query=Carlin%2C+C">C. Carlin</a>, <a href="/search/physics?searchtype=author&query=Carter%2C+P">P. Carter</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+C">C. Chen</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+J+-">J. -P. Chen</a> , et al. (80 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="1711.09089v2-abstract-short" style="display: inline;"> The Spin Asymmetries of the Nucleon Experiment (SANE) performed inclusive, double-polarized electron scattering measurements of the proton at the Continuous Electron Beam Accelerator Facility at Jefferson Lab. A novel detector array observed scattered electrons of four-momentum transfer $2.5 < Q^2< 6.5$ GeV$^2$ and Bjorken scaling $0.3<x<0.8$ from initial beam energies of 4.7 and 5.9 GeV. Employin… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.09089v2-abstract-full').style.display = 'inline'; document.getElementById('1711.09089v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1711.09089v2-abstract-full" style="display: none;"> The Spin Asymmetries of the Nucleon Experiment (SANE) performed inclusive, double-polarized electron scattering measurements of the proton at the Continuous Electron Beam Accelerator Facility at Jefferson Lab. A novel detector array observed scattered electrons of four-momentum transfer $2.5 < Q^2< 6.5$ GeV$^2$ and Bjorken scaling $0.3<x<0.8$ from initial beam energies of 4.7 and 5.9 GeV. Employing a polarized proton target whose magnetic field direction could be rotated with respect to the incident electron beam, both parallel and near perpendicular spin asymmetries were measured, allowing model-independent access to transverse polarization observables $A_1$, $A_2$, $g_1$, $g_2$ and moment $d_2$ of the proton. This document summarizes the operation and performance of the polarized target, polarized electron beam, and novel detector systems used during the course of the experiment, and describes analysis techniques utilized to access the physics observables of interest. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.09089v2-abstract-full').style.display = 'none'; document.getElementById('1711.09089v2-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 December, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 November, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-17-2595 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1703.06165">arXiv:1703.06165</a> <span> [<a href="https://arxiv.org/pdf/1703.06165">pdf</a>, <a href="https://arxiv.org/format/1703.06165">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> </div> </div> <p class="title is-5 mathjax"> Polarized fusion, its Implications and plans for Direct Measurements in a Tokamak </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Sandorfi%2C+A+M">A. M. Sandorfi</a>, <a href="/search/physics?searchtype=author&query=Deur%2C+A">A. Deur</a>, <a href="/search/physics?searchtype=author&query=Hanretty%2C+C">C. Hanretty</a>, <a href="/search/physics?searchtype=author&query=Jackson%2C+G+L">G. L. Jackson</a>, <a href="/search/physics?searchtype=author&query=Lanctot%2C+M">M. Lanctot</a>, <a href="/search/physics?searchtype=author&query=Liu%2C+J">J. Liu</a>, <a href="/search/physics?searchtype=author&query=Lowry%2C+M+M">M. M. Lowry</a>, <a href="/search/physics?searchtype=author&query=Miller%2C+G+W">G. W. Miller</a>, <a href="/search/physics?searchtype=author&query=Pace%2C+D">D. Pace</a>, <a href="/search/physics?searchtype=author&query=Smith%2C+S+P">S. P. Smith</a>, <a href="/search/physics?searchtype=author&query=Wei%2C+K">K. Wei</a>, <a href="/search/physics?searchtype=author&query=Wei%2C+X">X. Wei</a>, <a href="/search/physics?searchtype=author&query=Zheng%2C+X">X. Zheng</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="1703.06165v1-abstract-short" style="display: inline;"> A long-term energy option that is just approaching the horizon after decades of struggle, is fusion. Recent developments allow us to apply techniques from spin physics to advance its viability. The cross section for the primary fusion fuel in a tokamak reactor, D+T=>alpha+n, would be increased by a factor of 1.5 if the fuels were polarized. Simulations predict further non-linear power gains in lar… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1703.06165v1-abstract-full').style.display = 'inline'; document.getElementById('1703.06165v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1703.06165v1-abstract-full" style="display: none;"> A long-term energy option that is just approaching the horizon after decades of struggle, is fusion. Recent developments allow us to apply techniques from spin physics to advance its viability. The cross section for the primary fusion fuel in a tokamak reactor, D+T=>alpha+n, would be increased by a factor of 1.5 if the fuels were polarized. Simulations predict further non-linear power gains in large-scale machines such as ITER, due to increased alpha heating. These are significant enhancements that could lower the requirements needed to reach ignition and could be used to extend useful reactor life by compensating for neutron degradation. The potential realization rests on the survival of spin polarization for periods comparable to the energy containment time. Interest in polarized fuel options had an initial peak of activity in the 1980s, where calculations predicted that polarizations could in fact survive a plasma. However, concerns were raised regarding the cumulative impacts of fuel recycling from the reactor walls. In addition, the technical challenges of preparing and handling polarized materials prevented direct tests. Over the last several decades, this situation has changed dramatically. Detailed simulations of the ITER plasma have projected negligible wall recycling in a high power reactor. In addition, a combination of advances in three areas - polarized material technologies, polymer pellets developed for Inertial Confinement, and cryogenic injection guns developed for delivering fuel into the core of tokamaks - have matured to the point where a direct it in situ measurement is possible. A Jefferson Lab - DIII-D/General Atomics - University of Virginia collaboration is developing designs for a proof-of-principle polarization survival experiment using the isospin mirror reaction, D+3He=>alpha+p, at the DIII-D tokamak in San Diego. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1703.06165v1-abstract-full').style.display = 'none'; document.getElementById('1703.06165v1-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 March, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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">Proc. 22nd International Spin Symposium (SPIN'16), University of Illinois, Urbana IL, Sept 25-30, 2016 8 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLab-14727 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1512.03699">arXiv:1512.03699</a> <span> [<a href="https://arxiv.org/pdf/1512.03699">pdf</a>, <a href="https://arxiv.org/format/1512.03699">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> <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/10.1063/1.4949369">10.1063/1.4949369 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First Results from The GlueX Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=The+GlueX+Collaboration"> The GlueX Collaboration</a>, <a href="/search/physics?searchtype=author&query=Ghoul%2C+H+A">H. Al Ghoul</a>, <a href="/search/physics?searchtype=author&query=Anassontzis%2C+E+G">E. G. Anassontzis</a>, <a href="/search/physics?searchtype=author&query=Barbosa%2C+F">F. Barbosa</a>, <a href="/search/physics?searchtype=author&query=Barnes%2C+A">A. Barnes</a>, <a href="/search/physics?searchtype=author&query=Beattie%2C+T+D">T. D. Beattie</a>, <a href="/search/physics?searchtype=author&query=Bennett%2C+D+W">D. W. Bennett</a>, <a href="/search/physics?searchtype=author&query=Berdnikov%2C+V+V">V. V. Berdnikov</a>, <a href="/search/physics?searchtype=author&query=Black%2C+T">T. Black</a>, <a href="/search/physics?searchtype=author&query=Boeglin%2C+W">W. Boeglin</a>, <a href="/search/physics?searchtype=author&query=Brooks%2C+W+K">W. K. Brooks</a>, <a href="/search/physics?searchtype=author&query=Cannon%2C+B">B. Cannon</a>, <a href="/search/physics?searchtype=author&query=Chernyshov%2C+O">O. Chernyshov</a>, <a href="/search/physics?searchtype=author&query=Chudakov%2C+E">E. Chudakov</a>, <a href="/search/physics?searchtype=author&query=Crede%2C+V">V. Crede</a>, <a href="/search/physics?searchtype=author&query=Dalton%2C+M+M">M. M. Dalton</a>, <a href="/search/physics?searchtype=author&query=Deur%2C+A">A. Deur</a>, <a href="/search/physics?searchtype=author&query=Dobbs%2C+S">S. Dobbs</a>, <a href="/search/physics?searchtype=author&query=Dolgolenko%2C+A">A. Dolgolenko</a>, <a href="/search/physics?searchtype=author&query=Dugger%2C+M">M. Dugger</a>, <a href="/search/physics?searchtype=author&query=Egiyan%2C+H">H. Egiyan</a>, <a href="/search/physics?searchtype=author&query=Eugenio%2C+P">P. Eugenio</a>, <a href="/search/physics?searchtype=author&query=Foda%2C+A+M">A. M. Foda</a>, <a href="/search/physics?searchtype=author&query=Frye%2C+J">J. Frye</a>, <a href="/search/physics?searchtype=author&query=Furletov%2C+S">S. Furletov</a> , et al. (86 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="1512.03699v4-abstract-short" style="display: inline;"> The GlueX experiment at Jefferson Lab ran with its first commissioning beam in late 2014 and the spring of 2015. Data were collected on both plastic and liquid hydrogen targets, and much of the detector has been commissioned. All of the detector systems are now performing at or near design specifications and events are being fully reconstructed, including exclusive production of $蟺^{0}$, $畏$ and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1512.03699v4-abstract-full').style.display = 'inline'; document.getElementById('1512.03699v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1512.03699v4-abstract-full" style="display: none;"> The GlueX experiment at Jefferson Lab ran with its first commissioning beam in late 2014 and the spring of 2015. Data were collected on both plastic and liquid hydrogen targets, and much of the detector has been commissioned. All of the detector systems are now performing at or near design specifications and events are being fully reconstructed, including exclusive production of $蟺^{0}$, $畏$ and $蠅$ mesons. Linearly-polarized photons were successfully produced through coherent bremsstrahlung and polarization transfer to the $蟻$ has been observed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1512.03699v4-abstract-full').style.display = 'none'; document.getElementById('1512.03699v4-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> 14 January, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 December, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2015. </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, 6 figures, Invited contribution to the Hadron 2015 Conference, Newport News VA, September 2015</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-16-2195 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> AIP Conf. Proc. 1735, 020001 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1408.0215">arXiv:1408.0215</a> <span> [<a href="https://arxiv.org/pdf/1408.0215">pdf</a>, <a href="https://arxiv.org/format/1408.0215">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="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> A study of decays to strange final states with GlueX in Hall D using components of the BaBar DIRC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=The+GlueX+Collaboration"> The GlueX Collaboration</a>, <a href="/search/physics?searchtype=author&query=Dugger%2C+M">M. Dugger</a>, <a href="/search/physics?searchtype=author&query=Ritchie%2C+B">B. Ritchie</a>, <a href="/search/physics?searchtype=author&query=Senderovich%2C+I">I. Senderovich</a>, <a href="/search/physics?searchtype=author&query=Anassontzis%2C+E">E. Anassontzis</a>, <a href="/search/physics?searchtype=author&query=Ioannou%2C+P">P. Ioannou</a>, <a href="/search/physics?searchtype=author&query=Kourkoumeli%2C+C">C. Kourkoumeli</a>, <a href="/search/physics?searchtype=author&query=Vasileiadis%2C+G">G. Vasileiadis</a>, <a href="/search/physics?searchtype=author&query=Voulgaris%2C+G">G. Voulgaris</a>, <a href="/search/physics?searchtype=author&query=Jarvis%2C+N">N. Jarvis</a>, <a href="/search/physics?searchtype=author&query=Levine%2C+W">W. Levine</a>, <a href="/search/physics?searchtype=author&query=Mattione%2C+P">P. Mattione</a>, <a href="/search/physics?searchtype=author&query=McGinley%2C+W">W. McGinley</a>, <a href="/search/physics?searchtype=author&query=Meyer%2C+C+A">C. A. Meyer</a>, <a href="/search/physics?searchtype=author&query=Schumacher%2C+R">R. Schumacher</a>, <a href="/search/physics?searchtype=author&query=Staib%2C+M">M. Staib</a>, <a href="/search/physics?searchtype=author&query=Klein%2C+F">F. Klein</a>, <a href="/search/physics?searchtype=author&query=Sober%2C+D">D. Sober</a>, <a href="/search/physics?searchtype=author&query=Sparks%2C+N">N. Sparks</a>, <a href="/search/physics?searchtype=author&query=Walford%2C+N">N. Walford</a>, <a href="/search/physics?searchtype=author&query=Doughty%2C+D">D. Doughty</a>, <a href="/search/physics?searchtype=author&query=Barnes%2C+A">A. Barnes</a>, <a href="/search/physics?searchtype=author&query=Jones%2C+R">R. Jones</a>, <a href="/search/physics?searchtype=author&query=McIntyre%2C+J">J. McIntyre</a>, <a href="/search/physics?searchtype=author&query=Mokaya%2C+F">F. Mokaya</a> , et al. (82 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="1408.0215v1-abstract-short" style="display: inline;"> We propose to enhance the kaon identification capabilities of the GlueX detector by constructing an FDIRC (Focusing Detection of Internally Reflected Cherenkov) detector utilizing the decommissioned BaBar DIRC components. The GlueX FDIRC would significantly enhance the GlueX physics program by allowing one to search for and study hybrid mesons decaying into kaon final states. Such systematic studi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1408.0215v1-abstract-full').style.display = 'inline'; document.getElementById('1408.0215v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1408.0215v1-abstract-full" style="display: none;"> We propose to enhance the kaon identification capabilities of the GlueX detector by constructing an FDIRC (Focusing Detection of Internally Reflected Cherenkov) detector utilizing the decommissioned BaBar DIRC components. The GlueX FDIRC would significantly enhance the GlueX physics program by allowing one to search for and study hybrid mesons decaying into kaon final states. Such systematic studies of kaon final states are essential for inferring the quark flavor content of hybrid and conventional mesons. The GlueX FDIRC would reuse one-third of the synthetic fused silica bars that were utilized in the BaBar DIRC. A new focussing photon camera, read out with large area photodetectors, would be developed. We propose operating the enhanced GlueX detector in Hall D for a total of 220 days at an average intensity of 5x10^7 纬/s, a program that was conditionally approved by PAC39 <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1408.0215v1-abstract-full').style.display = 'none'; document.getElementById('1408.0215v1-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 August, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 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">25 pages, 29 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> C12-12-002 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1406.6115">arXiv:1406.6115</a> <span> [<a href="https://arxiv.org/pdf/1406.6115">pdf</a>, <a href="https://arxiv.org/format/1406.6115">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="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.nima.2014.12.017">10.1016/j.nima.2014.12.017 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Heavy Photon Search Test Detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Battaglieri%2C+M">Marco Battaglieri</a>, <a href="/search/physics?searchtype=author&query=Boyarinov%2C+S">Sergey Boyarinov</a>, <a href="/search/physics?searchtype=author&query=Bueltmann%2C+S">Stephen Bueltmann</a>, <a href="/search/physics?searchtype=author&query=Burkert%2C+V">Volker Burkert</a>, <a href="/search/physics?searchtype=author&query=Celentano%2C+A">Andrea Celentano</a>, <a href="/search/physics?searchtype=author&query=Charles%2C+G">Gabriel Charles</a>, <a href="/search/physics?searchtype=author&query=Cooper%2C+W">William Cooper</a>, <a href="/search/physics?searchtype=author&query=Cuevas%2C+C">Chris Cuevas</a>, <a href="/search/physics?searchtype=author&query=Dashyan%2C+N">Natalia Dashyan</a>, <a href="/search/physics?searchtype=author&query=DeVita%2C+R">Raffaella DeVita</a>, <a href="/search/physics?searchtype=author&query=Desnault%2C+C">Camille Desnault</a>, <a href="/search/physics?searchtype=author&query=Deur%2C+A">Alexandre Deur</a>, <a href="/search/physics?searchtype=author&query=Egiyan%2C+H">Hovanes Egiyan</a>, <a href="/search/physics?searchtype=author&query=Elouadrhiri%2C+L">Latifa Elouadrhiri</a>, <a href="/search/physics?searchtype=author&query=Essig%2C+R">Rouven Essig</a>, <a href="/search/physics?searchtype=author&query=Fadeyev%2C+V">Vitaliy Fadeyev</a>, <a href="/search/physics?searchtype=author&query=Field%2C+C">Clive Field</a>, <a href="/search/physics?searchtype=author&query=Freyberger%2C+A">Arne Freyberger</a>, <a href="/search/physics?searchtype=author&query=Gershtein%2C+Y">Yuri Gershtein</a>, <a href="/search/physics?searchtype=author&query=Gevorgyan%2C+N">Nerses Gevorgyan</a>, <a href="/search/physics?searchtype=author&query=Girod%2C+F">Francois-Xavier Girod</a>, <a href="/search/physics?searchtype=author&query=Graf%2C+N">Norman Graf</a>, <a href="/search/physics?searchtype=author&query=Graham%2C+M">Mathew Graham</a>, <a href="/search/physics?searchtype=author&query=Griffioen%2C+K">Keith Griffioen</a>, <a href="/search/physics?searchtype=author&query=Grillo%2C+A">Alexander Grillo</a> , et al. (39 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="1406.6115v3-abstract-short" style="display: inline;"> The Heavy Photon Search (HPS), an experiment to search for a hidden sector photon in fixed target electroproduction, is preparing for installation at the Thomas Jefferson National Accelerator Facility (JLab) in the Fall of 2014. As the first stage of this project, the HPS Test Run apparatus was constructed and operated in 2012 to demonstrate the experiment's technical feasibility and to confirm th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1406.6115v3-abstract-full').style.display = 'inline'; document.getElementById('1406.6115v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1406.6115v3-abstract-full" style="display: none;"> The Heavy Photon Search (HPS), an experiment to search for a hidden sector photon in fixed target electroproduction, is preparing for installation at the Thomas Jefferson National Accelerator Facility (JLab) in the Fall of 2014. As the first stage of this project, the HPS Test Run apparatus was constructed and operated in 2012 to demonstrate the experiment's technical feasibility and to confirm that the trigger rates and occupancies are as expected. This paper describes the HPS Test Run apparatus and readout electronics and its performance. In this setting, a heavy photon can be identified as a narrow peak in the e$^+$e$^-$ invariant mass spectrum, above the trident background or as a narrow invariant mass peak with a decay vertex displaced from the production target, so charged particle tracking and vertexing are needed for its detection. In the HPS Test Run, charged particles are measured with a compact forward silicon microstrip tracker inside a dipole magnet. Electromagnetic showers are detected in a PbW0$_{4}$ crystal calorimeter situated behind the magnet, and are used to trigger the experiment and identify electrons and positrons. Both detectors are placed close to the beam line and split top-bottom. This arrangement provides sensitivity to low-mass heavy photons, allows clear passage of the unscattered beam, and avoids the spray of degraded electrons coming from the target. The discrimination between prompt and displaced e$^+$e$^-$ pairs requires the first layer of silicon sensors be placed only 10~cm downstream of the target. The expected signal is small, and the trident background huge, so the experiment requires very large statistics. Accordingly, the HPS Test Run utilizes high-rate readout and data acquisition electronics and a fast trigger to exploit the essentially 100% duty cycle of the CEBAF accelerator at JLab. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1406.6115v3-abstract-full').style.display = 'none'; document.getElementById('1406.6115v3-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 June, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 June, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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">Revised version to match published version, 16 pages, 18 figures, published in Nuclear Instruments and Methods in Physics Research Section A, editor: Per Hansson Adrian</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> SLAC-PUB-15999 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nuclear Inst. and Methods in Physics Research, A Volume 777, 21 March 2015, Pages 91-101, ISSN 0168-9002 </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 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