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) ~ 0.86 with about three percent uncertainty in the central value.

B->D* at zero recoil revisited

GAMBINO, Paolo;
2010-01-01

Abstract

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) ~ 0.86 with about three percent uncertainty in the central value.
2010
81
113002-1
113002-6
http://arXiv.org/pdf/1004.2859.pdf
Paolo Gambino; Thomas Mannel; Nikolai Uraltsev
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/77693
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