Feed-down effect on Lambda spin polarization
Feed-down effect on Lambda spin polarization
复制标题
对 Lambda 自旋极化的馈送效应
DOI：
10.1103/physrevc.100.014913
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发表时间：
2019
影响因子：
3.1
通讯作者：
Huang Huan Zhong
中科院分区：
文献类型：
--
作者：
Xia Xiao Liang;Li Hui;Huang Xu Guang;Huang Huan Zhong
我们建立了一个理论框架来研究高位奇异重子对超子自旋极化的反馈效应。在此框架下，我们考虑了两体衰变通过强、电磁和弱过程，并采用螺旋形式导出了子粒子的角分布和自旋极化的一般公式。以实际实验数据为输入，探讨了反馈对全局极化和局部极化的贡献，发现这种贡献抑制了原始极化，但不足以解决当前关于极化方位角依赖的理论和实验结果之间的差异。我们的论文也可用于测量重子的自旋极化。在未来的实验中。
We develop a theoretical framework to study the feed-down effect of higher-lying strange baryons on the spin polarization of thehyperon. In this framework, we consider two-body decays through strong, electromagnetic, and weak processes and derive general formulas for the angular distribution and spin polarization of the daughter particle by adopting the helicity formalism. Using the realistic experimental data as input, we explore the feed-down contribution to the global and the localpolarizations and find that such a contribution suppresses the primordialpolarization, which is not strong enough to resolve the discrepancy between the current theoretical and the experimental results on the azimuthal-angle dependence ofpolarization. Our paper may also be useful for the measurement of spin polarization of baryons heavier than(e.g.,) in future experiments.