Revisiting quark and gluon polarization in the proton at the EIC

Revisiting quark and gluon polarization in the proton at the EIC
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在 EIC 重新审视质子中的夸克和胶子极化

DOI：
10.1103/physrevd.104.034028
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发表时间：
2021
期刊：
Physical Review D
影响因子：
5
通讯作者：
Sato, N.
Sato, N.
中科院分区：
物理与天体物理2区
文献类型：
--
作者：
Zhou, Y.;Cocuzza, C.;Delcarro, F.;Melnitchouk, W.;Metz, A.;Sato, N.

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我们提出了一个全面的影响研究未来电子离子对撞机（EIC）数据的宇称守恒和宇称违反极化不对称性对质子中夸克和胶子螺旋分布的影响。本研究基于JAM蒙特卡罗全局QCD分析框架，探讨了外推不确定性和SU(3)风味对称性约束在模拟双自旋不对称性中的作用，以及在小部分子动量分数下对提取的部分子极化的影响。我们发现关于外推和SU(3)对称的不同假设可以对整合的夸克和胶子极化、极化的质子、氘核和光束产生重大影响。对于违反宇称的不对称，我们研究了不同外推对极化奇异夸克分布的潜在影响，发现约束力最终受到EIC机光度的限制。
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,, at small parton momentum fractionsand its effect on the extracted parton polarizations. We find that different assumptions aboutextrapolations and SU(3) symmetry can have significant consequences for the integrated quark and gluon polarizations, for polarized proton, deuteron, andbeams. For the parity-violating asymmetry,, we study the potential impact on the polarized strange quark distribution with different extrapolations of, finding the constraining power to be ultimately limited by the EIC machine luminosity.
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期刊： EUROPEAN PHYSICAL JOURNAL C
影响因子： 4.4
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DOI： --
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