论文标题
$ \ bm {λ_b\toλ（1520）（\ to n \ bar {k}）\ ell^+\ ell^ - } $ decay由Baryon Spectroscopy支持
Transition form factors and angular distributions of the $\bm{Λ_b\toΛ(1520)(\to N\bar{K})\ell^+\ell^-}$ decay supported by baryon spectroscopy
论文作者
论文摘要
我们计算$λ_b\toλ（1520）$过渡的弱过渡形式因素，并进一步计算稀有衰减的角度分布$λ_b\toλ（1520）（\ to n \ bar {k}） （$ n \ bar {k} = \ {pk^ - ，n \ bar {k}^0 \} $），带有uncolarized $λ_b$和巨大的leptons。形式因素是由三体光夸克模型计算得出的，并支持$λ_b$和$λ（1520）$的数值波函数，从求解与高斯扩展方法相关的半偏差潜在模型。通过拟合观察到的单底部和诱人的重子的质谱，潜在模型的参数是固定的，因此该策略可以避免因选择巴元的简单谐波振荡器波函数而产生的不确定性。通过在LHCB实验中累积更多数据，我们的结果可以帮助探索$λ_b\toλ（1520）\ ell^+\ ell^ - $衰减，并加深对$ b \ to $ b \ to s \ ell^+ell^+ell^ell^ - $ processes的理解。
We calculate the weak transition form factors of the $Λ_b\toΛ(1520)$ transition, and further calculate the angular distributions of the rare decays $Λ_b\toΛ(1520)(\to N\bar{K})\ell^{+}\ell^{-}$ ($N\bar{K}=\{pK^-,n\bar{K}^0\}$) with unpolarized $Λ_b$ and massive leptons. The form factors are calculated by the three-body light-front quark model with the support of numerical wave functions of $Λ_b$ and $Λ(1520)$ from solving the semirelativistic potential model associated with the Gaussian expansion method. By fitting the mass spectrum of the observed single bottom and charmed baryons, the parameters of the potential model are fixed, so this strategy can avoid the uncertainties arising from the choice of a simple harmonic oscillator wave function of the baryons. With more data accumulated in the LHCb experiment, our result can help for exploring the $Λ_b\toΛ(1520)\ell^+\ell^-$ decay and deepen our understanding on the $b\to s\ell^+\ell^-$ processes.
