CLAS12 上质子深度虚康普顿散射的束流电荷不对称性
核实验
2023-11-14 v2 高能物理 - 实验
摘要
通过广义部分子分布（GPDs）对核子结构进行参数化，为核子内部动力学提供了新视角。为了直接解释它，深度虚康普顿散射（DVCS）是 GPDs 研究的黄金通道。DVCS 过程与 Bethe-Heitler（BH）机制干涉，构成 过程的领头阶振幅。利用极化正电子和电子束研究 反应，给出了一组唯一的完备观测量，以揭示 截面的不同贡献。这分离了不同的反应振幅，提供对其虚部和实部的直接获取，从而对 GPDs 提取中的模型依赖性和相关系统不确定性给出关键约束。BH-DVCS 干涉振幅的实部对参数化核子引力形状因子的 项特别敏感。干涉和 DVCS 振幅虚部的分离为可能的高扭度效应提供了见解。我们提议在 {\tt CLAS12} 上，使用 10.6 GeV 的极化正电子和电子束，在非极化氢靶上测量 过程的非极化与极化束流电荷不对称性（BCAs）。将在大的 相空间中，利用 100 天运行、亮度为 0.66cms 测量非极化与极化 BCAs 的方位角和 依赖性。
引用
@article{arxiv.2309.14041,
title = {Beam Charge Asymmetries for Deeply Virtual Compton Scattering on the Proton at CLAS12},
author = {E. Voutier and V. Burkert and S. Niccolai and R. Paremuzyan and A. Afanasev and J. -S. Alvarado-Galeano and M. Atoui and L. Barion and M. Battaglieri and J. Bernauer and A. Bianconi and M. Bondi and W. Briscoe and A. Camsonne and R. Capobianco and A. Celentano and P. Chatagnon and T. Chetry and G. Ciullo and P. Cole and M. Contalbrigo and G. Costantini and M. Defurne and A. Deur and R. De Vita and S. Diehl and R. Dupré and L. Elouadrhiri and I. Fernando and A. Filippi and T. Forest and F. -X. Girod and G. Gosta and J. Grames and P. Gueye and S. Habet and M. Hattawy and D. Higinbotham and A. Hobart and C. Hyde and K. Joo and A. Kim and V. Klimenko and V. Kubarovsky and M. Leali and P. Lenisa and D. Marchand and L. Marsicano and V. Mascagna and D. Matamoros and M. McCaughan and B. McKinnon and S. Migliorati and H. S. Mitra and A. Movsisyan and C. Muñoz-Camacho and M. Osipenko and M. Ouillon and L. Pappalardo and B. Pasquini and E. Pasyuk and N. Pilleux and M. Poelker and B. Raue and M. Ripani and R. Santos and A. Schmidt and R. Singh and D. Sokhan and M. Spreafico and P. Stoler and I. Strakovsky and M. Taiuti and L. Venturelli and P. -K. Wang and X. Wei and Z. Zhao and the CLAS Collaboration and the Jefferson Lab Positron Working Group},
journal= {arXiv preprint arXiv:2309.14041},
year = {2023}
}
备注
Proposal to the Jefferson Lab Program Advisory Committee (PAC51)