Hadronic structure functions in the e+ e- → (Λ)over-barΛ reaction
Hadronic structure functions in the e+ e- → (Λ)over-barΛ reaction
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DOI：
10.1016/j.physletb.2017.06.011
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发表时间：
2017-09-10
影响因子：
4.4
通讯作者：
Kupsc, Andrzej
中科院分区：
文献类型：
--
作者：
Faldt, Goran;Kupsc, Andrzej
计算了反应e（+）e（-）-> J/psi ->（Lambda）over bar（->（p）over bar pi（+））Lambda（-> p pi（-））以及矢量介子介导的湮灭反应的截面分布。超子衰变分布取决于一些结构函数，这些结构函数在λ超子的可能复杂的灵能形式因子G（M）（psi）和G（E）（psi）中是双线性的。这些形状因子的相对大小和相对相位可以从λ超子和反λ超子的非极化联合衰变分布中唯一地确定。还可以确定λ超子和反λ超子的衰变非对称性参数。(C)2017作者出版社：Elsevier B. V.
Cross-section distributions are calculated for the reaction e(+)e(-) -> J/psi -> (Lambda) over bar(-> (p) over bar pi(+)) Lambda(-> p pi(-)), and related annihilation reactions mediated by vector mesons. The hyperon-decay distributions depend on a number of structure functions that are bilinear in the, possibly complex, psionic form factors G(M)(psi) and G(E)(psi) of the Lambda hyperon. The relative size and relative phase of these form factors can be uniquely determined from the unpolarized joint-decay distributions of the Lambda and anti-Lambda hyperons. Also the decay-asymmetry parameters of Lambda and anti-Lambda hyperons can be determined. (C) 2017 The Authors. Published by Elsevier B.V.