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arXiv · 0807.0202

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

Jan O. Eeg·Svjetlana Fajfer·Jernej F. Kamenik
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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.

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Jan O. Eeg, Svjetlana Fajfer, Jernej F. Kamenik. 2008-07-01. Chiral corrections to the scalar form factor in B_q to D_q transitions. https://doi.org/10.1103/physrevd.78.074008

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