论文标题
fcnc $ξ_{qq} \toλ_ql^+ l^ - $ decay in Light-cone总和规则的分析
Analysis of FCNC $Ξ_{QQ} \to Λ_Q l^+ l^-$ decay in light-cone sum rules
论文作者
论文摘要
The weak decays of doubly heavy $Ξ_{QQ}$ baryon induced by flavor changing $b \to d$ and $ c \to u$ flavor changing neutral current within the light cone sum rules are studied.使用$λ_q$ baryon的光锥分布振幅的平行组件，为相应的过渡形式构建和分析了总和规则。估计了$ξ_{qq} \至λ_ql^+ l^ - $衰减的相应分支比率的结果。尽管$ b \ d $ transition引起的分支比率约为$ 10^{ - 9} $，在$ c \ to u $ threstion case中，发现为$ 10^{ - 13} $。因此，$ξ_{bb} \toλ_bl^+ l^ - $ decay有可能在LHCB上发现。但是，由于获得的分支比的极小值，很难测量$ξ_{bb} \toλ_bl^+ l^ - $。我们对分支比率的结果也将与轻型方法的结果进行比较。
The weak decays of doubly heavy $Ξ_{QQ}$ baryon induced by flavor changing $b \to d$ and $ c \to u$ flavor changing neutral current within the light cone sum rules are studied. Using the parallel components of the light cone distribution amplitudes for $Λ_Q$ baryon, the sum rules are constructed and analyzed for the corresponding transition form factors. Having the results for the form factors, the corresponding branching ratios for $Ξ_{QQ} \to Λ_Q l^+ l^-$ decays are estimated. While the branching ratio due to $b \to d$ transition is around $10^{-9}$, in $c \to u$ transition case, it is found as around $10^{-13}$. Hence, $Ξ_{bb} \to Λ_b l^+ l^-$ decay has the potential of being discovered at LHCb. However, $Ξ_{bb} \to Λ_b l^+ l^-$ is difficult to be measured due to the extremely small values of obtained branching ratio. Our results on the branching ratio are also compared with the results of the light-front approach.
