Combining exclusive semi-leptonic and hadronic B decays to measure |V_ub|

Abstract

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 Jψ. 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 Jψvertex. In order to relate the hadronic form factors in the B -> pi Jψand B -> pi + l + antineutrino_l decays, we use form factor relations that hold for heavy-to-light transitions at large recoil.

Latex, 7 pages, no figures

References in corpus (10)

• $|V_{ub}|$ from exclusive $B$ and $D$ decays
• B Mesons
• Nonfactorizable Contributions to Nonleptonic Weak Decays of Heavy Mesons
• Form Factor Relations for Heavy-to-Light Transitions
• The contribution of the J/psi resonance to the radiative B decays
• Form factor relations for heavy-to-heavy and heavy-to-light meson transitions
• More on direct CP violation in b -> d + J/psi decays
• A new method of determining $|V_{ub}|$ by the processes $\bar{B}\to \rho l\bar{\nu }$ and $\bar{B} \to K^* l \lbar$
• Nonfactorization and Color-Suppressed $B\to \psi (\psi (2S))+K(K^{\ast })$ Decays
• Measurement of $V_{ub}$