Chiral corrections to the scalar form factor in Bq to Dq transitions
Abstract
We consider chiral loop corrections to the scalar form factor in Bq to Dq l nu decays. First we consider chiral corrections to the 1/mQ suppressed operators and then we propose the procedure for the extraction of the relevant form factor using lattice QCD results. In the case of Bs to Ds l nu decay we find that effects of kinematics and chiral corrections tend to cancel for the scalar form factor contributions. In particular the 1/mQ suppression of chiral corrections is compensated by the SU(3) flavor symmetry breaking corrections which can be as large as 30%. The calculated corrections are relevant for the precise determination of possible new physics effects in Bq to Dq l nu decays.
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