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arXiv 2507.02495nucl-thhep-ph
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关于核双部分子分布的理论洞见

Theoretical insights on nuclear double parton distributions

Federico Alberto Ceccopieri, Filippo Fornetti, Emanuele Pace, Matteo Rinaldi, Giovanni Salmè, Nicholas Iles

AI总结:

本文在光前框架下推导核DPD的DPS1与DPS2贡献,推广并检验相关求和规则,利用AV18势计算氘核DPD,并提出类EMC比值以揭示DPS对EMC效应的意义。

摘要:

本文研究质子-核(pA)碰撞中的双部分子散射(DPS)。在光前方法框架内,我们形式化地推导了核双部分子分布(DPD)的两种贡献,即DPS1和DPS2:前者涉及来自同一核子的两个部分子,后者中的两个部分子则属于不同的母核子。随后,我们将强子DPD的求和规则推广到核情形,并解析地展示所有贡献如何结合以给出预期结果。此外,本文首次讨论了与DPS1和DPS2机制相关的DPD的部分求和规则。在核DPD的首次计算中,我们考虑氘核系统,采用由高度精细的核子-核子AV18势获得的真实波函数,并将其嵌入严格的庞加莱协变形式体系中。所得结果用于检验求和规则,并恰当地验证DPS1贡献可与DPS2贡献相比,尽管前者较小。我们还引入了涉及核DPD与自由DPD的类EMC比值,以探讨DPS在深入理解EMC效应方面可能发挥的作用。

英文摘要:

In this paper, we address double parton scattering (DPS) in pA collisions. Within the Light-Front approach, we formally derive the two contributions to the nuclear double parton distribution (DPD), namely: DPS1, involving two partons from the same nucleon, and DPS2, where the two partons belong to different parent nucleons. We then generalize the sum rule for hadron DPDs to the nuclear case and analytically show how all contributions combine to give the expected results. In addition partial sum rules for the DPDs related to DPS1 and DPS2 mechanisms are discussed for the first time. The deuteron system is considered for the first calculation of the nuclear DPD by using a realistic wave function obtained from the very refined nucleon-nucleon AV18 potential, embedded in a rigorous Poincaré covariant formalism. Results are used to test sum rules and properly verify that DPS1 contribution compares with the DPS2 one, although smaller. We also introduce EMC-like ratios involving nuclear and free DPDs to address the potential role of DPS in understanding in depth the EMC effect.

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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