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

Eeg, Jan O.; Fajfer, Svjetlana; Kamenik, Jernej F.

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

Authors

Eeg, Jan O.

Fajfer, Svjetlana

Kamenik, Jernej F.

Description

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