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arXiv 2005.07345nucl-exhep-ex
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RHIC的冷QCD研究

Recent results on cold-QCD from RHIC

Qing-hua Xu

摘要:

相对论重离子对撞机(RHIC)上的极化质子-质子碰撞为研究核子的自旋结构提供了独特的机会。我们将重点介绍最近在RHIC的STAR和PHENIX实验中关于核子自旋结构的结果:(1)质子中相当大的胶子极化是用喷流和强子产生的纵向双自旋不对称性测量的;(2)W玻色子产生中的纵向单自旋不对称性改善了对海夸克极化的约束。新的自旋不对称性结果证实了质子中轻海夸克极化的SU(2)味不对称性;(3)强子系统中的横自旋效应为共线和横动量相关框架下的部分子分布函数提供了新的含义。我们还将讨论STAR前向探测器升级的近期计划以及2021年以后STAR质子-质子和质子-离子碰撞的前景。

英文摘要:

Polarized proton-proton collisions at the Relativistic Heavy Ion Collider (RHIC) provide unique opportunities to study the spin structure of the nucleon. We will highlight recent results on the nucleon spin structure from the STAR and PHENIX experiments at RHIC: (1) A sizable gluon polarization in the proton is measured with longitudinal double spin asymmetries of jet and hadron production; (2) Longitudinal single spin asymmetries in W boson production improve constraints on the sea quark polarization. The new spin asymmetry results for W boson confirmed the SU(2) flavor asymmetry of the light sea quark polarization in the proton; (3) Transverse spin effects in hadronic systems offer new implications on parton distribution functions in the collinear and transverse momentum dependent frameworks. We will also discuss near term plans for the STAR forward detector upgrade and prospects for proton-proton and proton-ion collisions in the years beyond 2021 at STAR.

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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