利用CLAS12探测器对价夸克区域质子进行多微分深度虚康普顿散射（DVCS）截面测量
Multi-Differential DVCS Cross Section Measurement on the Proton in the Valence Region with CLAS12
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中文总结 AI 辅助
本研究利用CLAS12探测器获取质子价夸克区域1312个DVCS截面数据点，为提取康普顿形状因子、确定质子内部力学结构提供关键输入。
中文摘要 AI 辅助
我们利用CEBAF产生的10.6 GeV longitudinally polarized（纵向极化）电子束轰击液态氢靶，结合CLAS12探测器，完成了质子上深度虚康普顿散射（DVCS）的四重微分截面测量。本次分析共得到1312个数据点，拓展了价夸克区域的测量相空间，覆盖范围为0.06 < $x_B$ < 0.58、1.00 < $Q^2$ < 5.76 GeV$^2$、0.11 < $|t|$ < 1.00 GeV$^2$。DVCS截面测量通过与贝特-海特勒（Bethe-Heitler）过程的干涉，直接约束DVCS振幅的实部，是康普顿形状因子（CFFs）全局提取的关键输入，尤其是主导的CFF $H$。这些数据提升了对这些可观测量的灵敏度，可助力未来确定质子的内部力学结构。
英文摘要
We report the measurement of the four-fold differential cross section of deeply virtual Compton scattering (DVCS) on the proton using a longitudinally polarized 10.6 GeV CEBAF electron beam incident on a liquid-hydrogen target with the CLAS12 detector. The analysis provides 1312 data points, expanding the measured phase space in the valence quark region, 0.06 < $x_B$ < 0.58, 1.00 < $Q^2$ < 5.76 GeV$^2$, and 0.11 < $|t|$ < 1.00 GeV$^2$. DVCS cross section measurements directly constrain the real part of the DVCS amplitude through its interference with the Bethe-Heitler process, making them essential inputs to global extractions of the Compton Form Factors (CFFs), particularly the dominant CFF $H$. These data improve sensitivity to these observables and can contribute to future determinations of the proton's internal mechanical structure.
