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arXiv 2403.02587nucl-ex
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JLab Hall C未来的TCS测量

Future measurements of TCS at JLab Hall C

Debaditya Biswas, Marie Boër

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Proceedings of science, SPIN 2024
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AI总结：

本文研究在JLab Hall C利用极化光子束、非极化靶及SBS磁铁与Geant4模拟，评估通过双轻子光生测量TCS截面和束流自旋不对称性的可行性，以检验GPD普适性。

摘要：

广义部分子分布（GPDs）是理解核子三维结构的重要函数。深度虚康普顿散射（DVCS）是获取GPDs的反应之一，并且在过去约20年中一直得到测量。然而，为了进一步推进，我们需要寻找其他反应，例如类时康普顿散射（TCS），即其“时间反演”等价过程。事实上，分别从DVCS和TCS独立获取GPDs，将使我们能够研究它们的普适性等问题。任何关于GPD普适性的评估都将是本领域的一个里程碑。本文讨论了我们关于在双轻子光生反应中测量TCS的非极化和束流极化截面以及束流自旋不对称性的可行性的初步研究。为此，我们在JLab Hall C使用极化光子束和非极化靶。我们将讨论Geant4模拟，包括专用探测器装置以及使用SBS磁铁分离出射的e+、e−对。

英文摘要：

Generalized parton Distributions (GPDs) are important functions to understand the three dimensional structure of the nucleon. Deeply Virtual Compton Scattering is one of the reaction accessing GPDs, and has been measured for the past $\sim$20 years. However, to move forward, we need to look for other reactions, such as Timelike Compton Scattering (TCS), its "time-reversal" equivalent. Indeed, accessing GPDs from both DVCS and TCS independently will allow us, for instance, to study their universality. Any assesment on GPD's universality would be a milestone in our field. In this article we discuss our preliminary studies on the feasibility of measuring unpolarized and beam polarized cross sections and beam spin asymmetry for TCS in the dilepton photoproduction reaction. For that purpose, we use a polarized photon beam and an unpolarized target at JLab Hall C. We will discuss our Geant4 simulations, with a dedicated detector setup along with the use of the SBS magnet for separating outgoing $e^{+}$, $e^{-}$ pairs.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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