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arXiv 0906.0271hep-ex
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在STAR进行的包含性$A_{LL}$测量

Inclusive $A_{LL}$ Measurements at STAR

Adam Kocoloski

摘要:

RHIC自旋计划的主要目标之一是确定质子内的胶子极化分布。在首阶,$pp$碰撞涉及夸克-夸克、夸克-胶子和胶子-胶子散射的混合。在RHIC中,胶子-胶子和夸克-胶子贡献占主导地位,使加速器成为探索胶子极化的理想工具。STAR实验测量了纵向双自旋不对称性$A_{LL}$,包括产生喷流和π介子,以及在$\sqrt{s} = 200 GeV$产生喷流对面的带电π介子。结果提供了有价值的新的约束质子胶子极化时,包括在下一个领导秩序的全球分析。将讨论STAR测量的现状和未来测量的计划。

英文摘要:

One of the primary goals of the RHIC Spin program is to determine the gluon polarization distribution within the proton. At leading order, $pp$ collisions involve a mixture of quark-quark, quark-gluon, and gluon-gluon scattering. In RHIC, the gluon-gluon and quark-gluon contributions dominate, making the accelerator an ideal tool to explore gluon polarization. The STAR experiment has measured the longitudinal double-spin asymmetry $A_{LL}$ for inclusive production of jets and pions, and for charged pion production opposite a jet, at $\sqrt{s} = 200 GeV$. The results provide valuable new constraints on the gluon polarization in the proton when included in a next-to-leading-order global analysis. The current status of the STAR measurements and the plans for future measurements will be 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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