arXiv 2103.127732021-03nucl-exnucl-th

正电子束在SoLID上的双深虚康普顿散射

Double deeply virtual Compton scattering with positron beams at SoLID

S. Zhao, A. Camsonne, D. Marchand, M. Mazouz, N. Sparveris, S. Stepanyan, E. Voutier, Z. W. Zhao

备注：: 9 pages, 9 figures
DOI：: 10.1140/epja/s10050-021-00551-3

摘要：

双深虚康普顿散射（DDVCS）是唯一一种可以独立地确定广义部分子分布（GPD）对平均动量和转移动量依赖性的实验方法。讨论了非极化氢原子中电子诱导双μ子产生反应$\vv{e}^{\pm}p \to e^{\pm}pμ^+μ^-$的物理观测值。研究了在托马斯·杰斐逊国家加速器装置上用高亮度、大接受度的SoLID谱仪，用11GeV的极化和非极化正电子和电子束对它们的测量。这种实验配置被证明提供前所未有的访问GPD的康普顿形状因子${\mathcal H}$的实部和虚部的确定在一个未探索的相空间，并使更高的扭曲效应的探索性调查。

英文摘要：

Double Deeply Virtual Compton Scattering (DDVCS) is the only experimental channel for the determination of the dependence of the Generalized Parton Distributions (GPDs) on both the average and the transferred momentum independently. The physics observables of the electron induced di-muon production reaction $\vv{e}^{\pm}p \to e^{\pm}pμ^+μ^-$ off unpolarized hydrogen are discussed. Their measurement with the high luminosity and large acceptance SoLID spectrometer at the Thomas Jefferson National Accelerator Facility, using polarized and unpolarized positron and electron beams at 11 GeV is investigated. This experimental configuration is shown to provide unprecedented access to the GPDs with the determination of the real and imaginary parts of the Compton Form Factor ${\mathcal H}$ in an unexplored phase space, and to enable an exploratory investigation of higher twist effects.

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