Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-04-16
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages, 3 figures.
Scientific paper
We examine the B -> D* form factor at zero recoil using a continuum QCD approach rooted in the heavy quark sum rules framework. A refined evaluation of the radiative corrections as well as the most recent estimates of higher order power terms together with more careful continuum calculation are included. An upper bound on the form factor of F(1)< 0.93 is derived, based on just the positivity of inelastic contributions. A model-independent estimate of the inelastic contributions shows they are quite significant, lowering the form factor by about 6% or more. This results in an unbiased estimate F(1) \approx 0.86 with about three percent uncertainty in the central value.
Gambino Paolo
Mannel Thomas
Uraltsev Nikolai
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