Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-07-11
Phys.Rev. D55 (1997) 1418-1420
Physics
High Energy Physics
High Energy Physics - Phenomenology
Latex, 7 pages, no figures
Scientific paper
10.1103/PhysRevD.55.1418
The Cabibbo-Kobayashi-Maskawa matrix element |V_ub| can be extracted from the rate for the semi-leptonic decay B -> pi + l + antineutrino_l, with little theoretical uncertainty, provided the hadronic form factor for the B -> pi transition can be measured from some other B decay. In here, we suggest using the decay B -> pi J\psi. This is a color suppressed decay, and it cannot be properly described within the usual factorization approximation; we use instead a simple and very general phenomenological model for the b d J\psi vertex. In order to relate the hadronic form factors in the B -> pi J\psi and B -> pi + l + antineutrino_l decays, we use form factor relations that hold for heavy-to-light transitions at large recoil.
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