Chiral corrections to the scalar form factor in B_q to D_q transitions

Abstract

We consider chiral loop corrections to the scalar form factor in B_q to D_q l nu decays. First we consider chiral corrections to the 1/m_Q suppressed operators and then we propose the procedure for the extraction of the relevant form factor using lattice QCD results. In the case of B_s to D_s 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/m_Q 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 B_q to D_q l nu decays.

5 pages, 3 figures

References in corpus (2)

• B -> D tau nu Branching Ratios: Opportunity for Lattice QCD and Hadron Colliders
• Charged-Higgs effects in a new B -> D tau nu differential decay distribution

Cited by in corpus (1)

• Chiral loop corrections in B to D l nu decays