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arXiv 2108.10012nucl-ex
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在RHIC-STAR实验上测量Au+Au $\sqrt{s_{\mathrm{NN}}}$ = 7.2 GeV固定靶碰撞中$Λ$超子的全局极化

Measurement of global polarization of $Λ$ hyperons in Au+Au $\sqrt{s_{\mathrm{NN}}}$ = 7.2 GeV fixed target collisions at RHIC-STAR experiment

Kosuke Okubo

摘要:

在非中心核碰撞中,产生的物质应该表现出强涡度,这会引起自旋极化。全局极化是研究系统动力学的一个很好的工具。在不同的实验中测量了$Λ$和$\barΛ$超子在$\sqrt{s_{\mathrm{NN}}}$ = 2.4 GeV - 5.02 TeV的整体极化。我们在RHIC-STAR实验上测量了$\sqrt{s_{\mathrm{NN}}}$ = 7.2GeV的Au+Au碰撞中$Λ$超子的全局极化.观察到非零信号,并且其遵循朝向较低碰撞能量增加的$Λ$全局极化的全局趋势。在更外围的碰撞中,整体极化更大,但在不确定性范围内,它没有表现出任何显著的快度依赖性以及横向动量依赖性。

英文摘要:

In non-central nuclear collisions, the created matter should exhibit strong vorticity, which induces spin polarization. Global polarization is a good tool to investigate the dynamics of the system. Global polarization of $Λ$ and $\barΛ$ hyperons has been measured at $\sqrt{s_{\mathrm{NN}}}$ = 2.4 GeV - 5.02 TeV in various experiments. We have measured the global polarization of $Λ$ hyperons in Au+Au collisions with fixed-target configuration at $\sqrt{s_{\mathrm{NN}}}$ = 7.2 GeV at RHIC-STAR experiment. The non-zero signal is observed and it follows the global trend of $Λ$ global polarization that increases towards lower collision energies. The global polarization is larger in more peripheral collisions but it does not show any significant rapidity dependence as well as transverse momentum dependence within uncertainties.

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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