$|V_{cb}|$ from OPE Sum Rules for Heavy Flavor Transitions

Details $|V_{cb}|$ from OPE Sum Rules for Heavy Flavor Transitions $|V_{cb}|$ from OPE Sum Rules for Heavy Flavor Transitions

1994-05-03

arxiv.org/abs/hep-ph/9405207v1

Phys.Rev.D51:2217,1995; Erratum-ibid.D52:3149,1995

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages + uuencoded ps file with 1 figure, Latex, TPI-MINN-94/13-T, NSF-ITP-94-39

Scientific paper

10.1103/PhysRevD.51.2217 10.1103

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 account.

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