论文标题
在相对论夸克模型中
Rare radiative $Ξ^{-}_{b}\to Ξ^-γ$ decay in the relativistic quark model
论文作者
论文摘要
最近，LHCB合作对$ξ^{ - } _ {b} \rightArrowξ^{ - }γ$衰减分支比$ br（ξ^{ - } _ {b} _ {b} \ rightArrow了测得的值低于轻单和总规则预测。在本文中，根据基于Quasiptential方法和QCD，研究了$ξ^{ - } _ {b} $ baryon的罕见辐射衰减。衰减形式因素是用相对论效应的综合说明来计算的。发现分支比的结果被发现低于LHCB设置的上限，并且与基于SU（3）风味对称性，轻正面夸克模型和轻单QCD QCD总和规则的理论预测一致。
Recently the LHCb collaboration put the upper limit on the $Ξ^{-}_{b} \rightarrow Ξ^{-}γ$ decay branching ratio $Br(Ξ^{-}_{b} \rightarrow Ξ^{-}γ)< 1.3\times 10^{-4}$. The measured value is below the light-cone sum rule prediction. In this paper the rare radiative decay of the $Ξ^{-}_{b}$ baryon is studied in the framework of the relativistic quark model based on the quasipotential approach and QCD. The decay form factors are calculated with the comprehensive account of the relativistic effects. The obtained result for the branching ratio is found to be below the upper limit set by LHCb and is consistent with theoretical predictions based on the SU(3) flavor-symmetry, light-front quark model and light-cone QCD sum rules in full theory within theoretical uncertainties.
