通过束旋不对称性探测独占性π介质电子生产中的硬/软分解
核实验
2026-02-20 v1 高能物理 - 实验
高能物理 - 唯象学
摘要
深度独占介质生产(DEMP)反应，如 ，提供了通过微分截面和束旋/靶旋不对称性测量研究核子三维结构的机会。本工作旨在通过测量 反应来探测硬/软分解 regime 的开始，该反应在 Jefferson Lab Hall C 的 KaonLT 实验中测量得。10.6 GeV 的纵向极化电子束照射在未极化的液态氢靶上，散射电子和产生介质被检测于两个磁性聚焦光谱仪中，从而实现精确的截面测量。从束旋不对称 中提取截面比 。在固定 和 的条件下，测定 的 依赖性，覆盖 GeV 以上 GeV 范围内的动力学。进一步将这些数据与来自 CLAS/CLAS12 的最新结果合并，用于确定 在两个 (, ) 取值处的 依赖性。该比值相对平坦，在所探索的 范围内对 的值没有可测量的影响。结果与广义夸克分布(GPD)规范的预测进行比较，该规范显式依赖于硬/软分解，而Regge模型。Regge模型更好地预测 ，这表明分解 regime 尚未被到达。
关键词
引用
@article{arxiv.2512.01928,
title = {Probing hard/soft factorization via beam-spin asymmetry in exclusive pion electroproduction from the proton},
author = {Alicia C. Postuma and Garth M. Huber and D. J. Gaskell and N. Heinrich and T. Horn and M. Junaid and S. J. D. Kay and V. Kumar and P. Markowitz and J. Roche and R. Trotta and A. Usman and B. -G. Yu and T. K. Choi and K. -J. Kong and S. Ali and R. Ambrose and D. Androic and W. Armstrong and A. Bandari and V. Berdnikov and H. Bhatt and D. Bhetuwal and D. Biswas and M. Boer and P. Bosted and E. Brash and A. Camsonne and J. P. Chen and J. Chen and M. Chen and M. E. Christy and S. Covrig and M. M. Dalton and W. Deconinck and M. Diefenthaler and B. Duran and D. Dutta and M. Elaasar and R. Ent and H. Fenker and E. Fuchey and D. Hamilton and J. -O. Hansen and F. Hauenstein and S. Jia and M. K. Jones and S. Joosten and M. L. Kabir and A. Karki and C. Keppel and E. Kinney and N. Lashley-Colthirst and W. B. Li and D. Mack and S. Malace and M. McCaughan and Z. E. Meziani and R. Michaels and R. Montgomery and M. Muhoza and C. Munoz Camacho and G. Niculescu and I. Niculescu and Z. Papandreou and S. Park and E. Pooser and M. Rehfuss and B. Sawatzky and G. R. Smith and H. Szumila-Vance and A. Teymurazyan and H. Voskanyan and B. Wojtsekhowski and S. A. Wood and Z. Ye and C. Yero and J. Zhang and X. Zheng},
journal= {arXiv preprint arXiv:2512.01928},
year = {2026}
}
备注
9 pages, 7 figures, 2 tables (main text) plus 3 pages, 6 figures, 1 table (supplemental material / appendices)