CP symmetry tests in the cascade-anticascade decay of charmonium
CP symmetry tests in the cascade-anticascade decay of charmonium
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DOI：
10.1103/physrevd.100.114005
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发表时间：
2019-12-03
影响因子：
5
通讯作者：
Kupsc, Andrzej
中科院分区：
文献类型：
--
作者：
Adlarson, Patrik;Kupsc, Andrzej
我们使用级联的Xi -> λ -> p pi(-) pi弱衰减链和反级联的电荷共轭模式分析了charmonium衰变到Xi(Xi) / bar对的联合角分布。这些衰变可以直接比较重子和反重子的衰变特性，并对奇异重子扇区的CP对称性进行灵敏的测试。我们证明，由于弱衰变链之间的自旋相关性，所有涉及的衰变参数可以在矢量和（伪）标量charmonia中分别确定为Xi(Xi) / bar。与最近测量的ethorne e(+)e(-) -> J/psi -> Lambda(Lambda) over bar过程相反，不需要级联的横向极化，对衰减参数的不确定性几乎没有影响。
We analyze joint angular distributions of a charmonium decay to the Xi(Xi) over bar pair using the Xi -> Lambda pi -> p pi(-) pi weak decay chain for the cascade and the charge conjugated mode for the anticascade. The decays allow a direct comparison of the baryon and antibaryon decay properties and a sensitive test of CP symmetry in the strange baryon sector. We show that all involved decay parameters can be determined separately in vector and (pseudo)scalar charmonia decays into Xi(Xi) over bar due to the spin correlations between the weak decay chains. Contrary to the recently measured ethorne e(+)e(-) -> J/psi -> Lambda(Lambda) over bar process, the transverse polarization of the cascade is not needed and has almost no impact on the uncertainties of the decay parameters.