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在$Q^2 = $ 2.5，5.2，6.8和8.5 GeV $^2$弹性电子质子散射中的极化转移观测值

Polarization Transfer Observables in Elastic Electron Proton Scattering at $Q^2 = $2.5, 5.2, 6.8, and 8.5 GeV$^2$

A. J. R. Puckett, E. J. Brash, M. K. Jones, W. Luo, M. Meziane, L. Pentchev, C. F. Perdrisat, V. Punjabi, F. R. Wesselmann, A. Afanasev, A. Ahmidouch, I. Albayr… 展开作者

A. J. R. Puckett, E. J. Brash, M. K. Jones, W. Luo, M. Meziane, L. Pentchev, C. F. Perdrisat, V. Punjabi, F. R. Wesselmann, A. Afanasev, A. Ahmidouch, I. Albayrak, K. A. Aniol, J. Arrington, A. Asaturyan, H. Baghdasaryan, F. Benmokhtar, W. Bertozzi, L. Bimbot, P. Bosted, W. Boeglin, C. Butuceanu, P. Carter, S. Chernenko, E. Christy, M. Commisso, J. C. Cornejo, S. Covrig, S. Danagoulian, A. Daniel, A. Davidenko, D. Day, S. Dhamija, D. Dutta, R. Ent, S. Frullani, H. Fenker, E. Frlez, F. Garibaldi, D. Gaskell, S. Gilad, R. Gilman, Y. Goncharenko, K. Hafidi, D. Hamilton, D. W. Higinbotham, W. Hinton, T. Horn, B. Hu, J. Huang, G. M. Huber, E. Jensen, C. Keppel, M. Khandaker, P. King, D. Kirillov, M. Kohl, V. Kravtsov, G. Kumbartzki, Y. Li, V. Mamyan, D. J. Margaziotis, A. Marsh, Y. Matulenko, J. Maxwell, G. Mbianda, D. Meekins, Y. Melnik, J. Miller, A. Mkrtchyan, H. Mkrtchyan, B. Moffit, O. Moreno, J. Mulholland, A. Narayan, S. Nedev, Nuruzzaman, E. Piasetzky, W. Pierce, N. M. Piskunov, Y. Prok, R. D. Ransome, D. S. Razin, P. Reimer, J. Reinhold, O. Rondon, M. Shabestari, A. Shahinyan, K. Shestermanov, S. Sirca, I. Sitnik, L. Smykov, G. Smith, L. Solovyev, P. Solvignon, R. Subedi, E. Tomasi-Gustafsson, A. Vasiliev, M. Veilleux, B. B. Wojtsekhowski, S. Wood, Z. Ye, Y. Zanevsky, X. Zhang, Y. Zhang, X. Zheng, L. Zhu

备注：
44 pages, 28 figures. Archival publication for the GEp-III and GEp-2gamma experiments that ran in Jefferson Lab's experimental Hall C from October, 2007 to June, 2008. v2: final manuscript as accepted by PRC. v3: Replaced figures 13 and 19 with corrected versions from published Erratum. Also made minor corrections to the text and to Table XI reflecting the corrections in the published Erratum
发表信息：
Phys. Rev. C 96, 055203 (2017)
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摘要：

GEp-III和GEp-2 $γ$实验于2007年至2008年在杰斐逊实验室（JLab's）C厅进行，以将$G_E^p/G_M^p$的知识扩展到实际可实现的最高$Q^2$，并在弹性$\vec{e}p$散射的偏振转移观测值中寻找超出玻恩近似的影响。本文报告了对常见实验装置和数据分析程序的扩展描述，以及对两个实验数据的最终再分析结果，包括GEp-2 $γ$实验完全验收数据的先前未发表的结果。Hall C高动量光谱仪检测并测量了JLab极化电子束与液氢靶碰撞后弹性反冲的质子的极化。一个大接受电磁量能器检测到的弹性散射电子的一致性，以抑制非弹性背景。最终的GEP-III数据与最初公布的结果相比基本没有变化。相对于原始出版物，最终GEp-2 $γ$数据的统计不确定性在$ε= 0.632$和$0.783$中显著降低。$G_E^p/G_M^p$随$Q^2$的减少持续到$Q^2 = 8.5$ GeV $^2$，但相对于在早期Hall A测量中观察到的近似线性减少，以较慢的速率减少。在$Q^2 = 2.5$ GeV $^2$下，质子形状因子比$G_E^p/G_M^p$没有显示出统计学上显著的$ε$依赖性，正如玻恩近似中所预期的那样。纵向偏振传输分量与其玻恩值的比率$P_\ell/P_\ell^{Born}$显示出在$ε= 0.783$处相对于$ε= 0.149$的大约1.4\%的增强，其中$\approx 1.9σ$显著性基于总不确定性，这意味着在横向分量$P_t$中抵消比率$R$的类似效应。

英文摘要：

The GEp-III and GEp-2$γ$ experiments were carried out in Jefferson Lab's (JLab's) Hall C from 2007-2008, to extend the knowledge of $G_E^p/G_M^p$ to the highest practically achievable $Q^2$ and to search for effects beyond the Born approximation in polarization transfer observables of elastic $\vec{e}p$ scattering. This article reports an expanded description of the common experimental apparatus and data analysis procedure, and the results of a final reanalysis of the data from both experiments, including the previously unpublished results of the full-acceptance data of the GEp-2$γ$ experiment. The Hall C High Momentum Spectrometer detected and measured the polarization of protons recoiling elastically from collisions of JLab's polarized electron beam with a liquid hydrogen target. A large-acceptance electromagnetic calorimeter detected the elastically scattered electrons in coincidence to suppress inelastic backgrounds. The final GEp-III data are largely unchanged relative to the originally published results. The statistical uncertainties of the final GEp-2$γ$ data are significantly reduced at $ε= 0.632$ and $0.783$ relative to the original publication. The decrease with $Q^2$ of $G_E^p/G_M^p$ continues to $Q^2 = 8.5$ GeV$^2$, but at a slowing rate relative to the approximately linear decrease observed in earlier Hall A measurements. At $Q^2 = 2.5$ GeV$^2$, the proton form factor ratio $G_E^p/G_M^p$ shows no statistically significant $ε$-dependence, as expected in the Born approximation. The ratio $P_\ell/P_\ell^{Born}$ of the longitudinal polarization transfer component to its Born value shows an enhancement of roughly 1.4\% at $ε= 0.783$ relative to $ε= 0.149$, with $\approx 1.9σ$ significance based on the total uncertainty, implying a similar effect in the transverse component $P_t$ that cancels in the ratio $R$.

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