First CLAS12 Measurement of Deeply Virtual Compton Scattering Beam-Spin Asymmetries in the Extended Valence Region

First CLAS12 Measurement of Deeply Virtual Compton Scattering Beam-Spin Asymmetries in the Extended Valence Region
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首次 CLAS12 测量扩展价域中的深度虚拟康普顿散射束自旋不对称性

DOI:
10.1103/physrevlett.130.211902
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发表时间:
2023
影响因子:
8.6
通讯作者:
Baashen, L.
Baashen, L.
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Christiaens, G.;Defurne, M.;Sokhan, D.;Achenbach, P.;Akbar, Z.;Amaryan, M. J.;Atac, H.;Avakian, H.;Gayoso, C. Ayerbe;Baashen, L.

文献摘要

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深度虚康普顿散射(DVCS)允许人们探测描述核子三维结构的广义部分子分布。我们报告的DVCS束自旋不对称性的第一次测量使用CLAS12光谱仪与10.2和10.6 GeV的电子束散射从非极化质子。这些结果大大扩展了theand Bjorken相空间,超出了价区域中现有的数据,并提供了1600个新的数据点,这些数据点具有前所未有的统计不确定性,为未来的唯象学研究设置了新的严格约束。
Deeply virtual Compton scattering (DVCS) allows one to probe generalized parton distributions describing the 3D structure of the nucleon. We report the first measurement of the DVCS beam-spin asymmetry using the CLAS12 spectrometer with a 10.2 and 10.6 GeV electron beam scattering from unpolarized protons. The results greatly extend theand Bjorken-phase space beyond the existing data in the valence region and provide 1600 new data points measured with unprecedented statistical uncertainty, setting new, tight constraints for future phenomenological studies.