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arXiv 1002.2468hep-ph
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极化$pp$碰撞中超子前区的纵向极化

The longitudinal polarization of hyperons in the forward region in polarized $pp$ collisions

Wei Zhou, Shan-shan Zhou, Qing-hua Xu

摘要:

利用极化部分子密度的不同参数化和极化碎裂函数的不同模型,研究了RHIC能区单极化$pp$碰撞中正向赝快度$2.5<η<4$超子和反超子的纵向极化.结果表明,$Σ^+$极化能够区分高能碎裂过程中自旋转移的不同图像,而$Λ$和$\barΛ$超子的极化能够提供奇异海夸克螺旋度分布的灵敏度.讨论了束流剩余对超子极化的影响。

英文摘要:

We study the longitudinal polarization of hyperons and anti-hyperons at forward pseudorapidity, $2.5<η<4$, in singly polarized $pp$ collisions at RHIC energies by using different parameterizations of the polarized parton densities and different models for the polarized fragmentation functions. The results show that the $Σ^+$ polarization is able to distinguish different pictures on spin transfer in high energy fragmentation processes; and the polarization of $Λ$ and $\barΛ$ hyperons can provide sensitivity to the helicity distribution of strange sea quarks. The influence from beam remnant to hyperon polarization in the forward region is also discussed.

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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