arXiv 2402.011682024-02-05hep-ex

在STAR实验的$pp$碰撞中测量喷注内$\Lambda$/\bar{\Lambda}$的横向极化

Measurement of transverse polarization of $Λ$/$\barΛ$ within jet in $pp$ collisions at STAR

Taoya Gao

备注：: SPIN2023 proceeding

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AI总结：

本文报告了STAR实验在200 GeV质子-质子碰撞中首次测量喷注内Λ/反Λ横向极化的初步结果，旨在检验极化碎裂函数的普适性。

摘要：

在非极化的强子相互作用中，$\Lambda/\bar{\Lambda}$的自发极化已被实验观测近半个世纪，但仍缺乏明确的理论解释。一个可能的来源是极化碎裂函数（pFFs）所产生的效应，该函数描述了非极化部分子碎裂产生极化强子的过程。最近，在Belle实验的非极化$e^{+}e^{-}$湮灭中，观测到了$\Lambda/\bar{\Lambda}$显著的横向极化，其方向沿由推力轴和$\Lambda$动量所定义平面的法线方向。在非极化的$pp$碰撞中，测量喷注内$\Lambda/\bar{\Lambda}$的横向极化也能为pFFs提供重要的约束和普适性检验。本文报告了在$\sqrt{s}$ = 200 GeV的$pp$碰撞中首次测量喷注内$\Lambda/\bar{\Lambda}$极化的初步结果。用于该测量的数据由RHIC上的STAR实验于2015年采集。

英文摘要：

Spontaneous polarization of $Λ/\barΛ$ in unpolarized hadron interactions has been observed experimentally for nearly half a century and still eludes a definitive explanation. One possible origin is the effect arising from polarizing fragmentation functions (pFFs), which describe the production of polarized hadrons from the fragmentation of an unpolarized parton. Recently, significant transverse polarization of $Λ/\barΛ$ has been observed in unpolarized $e^{+}e^{-}$ annihilation at Belle experiment, along the normal to the plane defined by the thrust axis and $Λ$ momentum. In unpolarized $pp$ collisions, the measurement of transverse polarization of $Λ$/$\barΛ$ within jet could also provide important constraints and universality test for the pFFs. In this contribution, preliminary results on the first measurement of $Λ$/$\barΛ$ polarization within a jet in $pp$ collision at $\sqrt{s}$ = 200 GeV are reported. The data used for this measurement were taken by the STAR experiment at RHIC in 2015.

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