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arXiv 2105.04434hep-phnucl-th
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在EIC上重新讨论质子中的夸克和胶子极化

Revisiting quark and gluon polarization in the proton at the EIC

Y. Zhou, C. Cocuzza, F. Delcarro, W. Melnitchouk, A. Metz, N. Sato

摘要:

我们提出了一个全面的影响研究未来的电子-离子对撞机(EIC)的宇称守恒和宇称违反极化不对称的夸克和胶子螺旋度分布的质子数据。基于JAM Monte Carlo整体QCD分析框架,研究了外推不确定性和SU(3)味对称性约束在小部分子动量分数下模拟的双自旋不对称性$x$中的作用及其对提取的部分子极化的影响.我们发现,对于极化质子、氘核和$^3$ He束,关于$A_{LL}$外推和SU(3)对称性的不同假设对夸克和胶子的综合极化有重要影响。对于宇称破坏的不对称性$A_{UL}$,我们研究了不同的$A_{UL}$外推对极化奇异夸克分布的潜在影响,发现对极化奇异夸克分布的约束能力最终受到EIC机光度的限制.

英文摘要:

We present a comprehensive impact study of future Electron-Ion Collider (EIC) data for parity-conserving and parity-violating polarization asymmetries on quark and gluon helicity distributions in the proton. The study, which is based on the JAM Monte Carlo global QCD analysis framework, explores the role of the extrapolation uncertainty and SU(3) flavor symmetry constraints in the simulated double-spin asymmetry, $A_{LL}$, at small parton momentum fractions $x$ and its effect on the extracted parton polarizations. We find that different assumptions about $A_{LL}$ extrapolations and SU(3) symmetry can have significant consequences for the integrated quark and gluon polarizations, for polarized proton, deuteron and $^3$He beams. For the parity-violating asymmetry, $A_{UL}$, we study the potential impact on the polarized strange quark distribution with different extrapolations of $A_{UL}$, finding the constraining power to be ultimately limited by the EIC machine luminosity.

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