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.