Erratum: Operator product expansion sum rules for heavy flavor transitions and the determination of
- 1 September 1995
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 52 (5) , 3149
- https://doi.org/10.1103/physrevd.52.3149
Abstract
We derive a model-independent upper bound for the axial-vector form factor of the B\ra D^* transition at zero recoil, F_{B\ra D^*}. The form factor turns out to be noticeably less than unity. The deviation of F_{B\ra D^*} from unity is larger than previously anticipated. Using our estimate we extract |V_{cb}| from the measured exclusive rate of B\ra D^* l\nu extrapolated to the point of zero recoil. The central `` exclusive" value of |V_{cb}| is in agreement with the value obtained from the inclusive semileptonic width \Gamma (B\ra X_c l\nu). We argue that the theoretical uncertainty in determining |V_{cb}| from the total inclusive width is significantly reduced if a constraint on the quark mass difference m_b - m_c stemming from the heavy quark expansion is taken into accountKeywords
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