On the 1/m^2 corrections to the form-factors in /\_b -> /\_c semileptonic decays

Details On the 1/m^2 corrections to the form-factors in /\_b -> /\_c semileptonic decays On the 1/m^2 corrections to the form-factors in /\_b -> /\_c semileptonic decays

1994-05-23

arxiv.org/abs/hep-ph/9405360v1

Phys.Lett. B334 (1994) 399-404

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 8 pages, MZ-TH/94-16

Scientific paper

10.1016/0370-2693(94)90705-6

Model-independent bounds are presented for the form-factors describing the semileptonic decay $\Lambda_b\to\Lambda_ce\bar\nu_e$ at the end-point of the lepton energy spectrum. For the axial-vector form-factor $f_1^A(1)$ we obtain $f_1^A(1)\leq 0.960\div 0.935$, where the uncertainty arises from the value of $\mu_\pi^2$, the average kinetic energy of the $b$ quark inside of the $\Lambda_b$ baryon. A bound is given on the forward matrix element of the axial current in a $\Lambda_b$ baryon which is relevant for the inclusive semileptonic decays of the polarized $\Lambda_b$ decays.

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