Light-cone sum rule analysis of semileptonic decays Λb0 → Λc+ l- (ν)over-barl

In this work, we analyze the semileptonic decay processes of Lambda(b) -> Lambda(c) in the light-cone sum rule approach. In order to calculate the form factors of the Lambda(b) baryon transition matrix element, we use the light-cone distribution amplitudes of Lambda(b) obtained from the QCD sum rule in the heavy quark effective field theory framework. With the calculation of the six form factors of the Lambda b -> Lambda(c) transition matrix element, the differential decay widths of Lambda(0)(b) -> Lambda(+)(c) l(-) (nu) over bar (l) (l = e, mu, tau) and their absolute branching fractions are obtained. Additionally, the ratio of R (Lambda(+)(c)) = Br (Lambda(0)(b) -> Lambda(+)(c) tau(-) (nu) over bar (tau))/Br (Lambda(0)(b) -> Lambda(+)(c) mu(-) (nu) over bar (mu)) is also obtained in this work. Our results are in accord with the newest experimental result and other theoretical calculations and predictions.

Automated summary

In this study, the semileptonic decay processes of Λ(b) -> Λ(c) are analyzed using the light-cone sum rule approach. The form factors of the Λ(b) baryon transition matrix element are calculated using the light-cone distribution amplitudes obtained from the QCD sum rule in the heavy quark effective field theory framework. The results are consistent with the newest experimental result and other theoretical calculations and predictions.