Light-cone QCD sum rules for the semileptonic decay Lambda_b --> p lepton anti-neutrino
arXiv:hep-ph/0401094 · doi:10.1103/PhysRevD.69.094003
Abstract
The exclusive semileptonic heavy baryon decay Λ_b\to p l\barνis investigated using light-cone sum rule method in both full QCD and HQET. The form factors describing the decay are calculated and used to predict the decay width and differential distribution. The total decay width obtained from full QCD is in agreement with the previous theoretical predictions while the HQET result are typically one order smaller. Both results are consistent with the experimental upper limit and can be compared to the refined experimental data in the future.
RevTeX 4, formulas about distribution amplitudes and some misprints corrected, minor changes in numerical results, conclusions unchanged, publication version