Chiral corrections to the scalar form factor in B{sub q}{yields}D{sub q} transitions
- University of Oslo, Physics Department, P. O. Box 1048 Blindern, N-0316 Oslo 3 (Norway)
- J. Stefan Institute, Jamova 39, P. O. Box 3000, 1001 Ljubljana (Slovenia)
We consider chiral loop corrections to the scalar form factor in B{sub q}{yields}D{sub q}l{nu} decays. First we consider chiral corrections to the 1/m{sub Q} suppressed operators and then we propose a procedure for the extraction of the relevant form factor using lattice QCD results. In particular, the extraction of a B*{yields}D* matrix element on the lattice can be used to determine all the necessary 1/m{sub Q} suppressed contributions to the scalar form factor in B{yields}D transitions. In the case of (B{sub s}{yields}D{sub s})/(B{yields}D) decay rate ratios we speculate that effects of kinematics and chiral corrections tend to cancel for the scalar form factor contributions. In particular the 1/m{sub Q} suppression of chiral corrections is compensated by the potentially large SU(3) flavor symmetry breaking corrections. The calculated corrections are relevant for the precise determination of possible new physics effects in B{sub q}{yields}D{sub q}l{nu} decays.
- OSTI ID:
- 21254277
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 78, Issue 7; Other Information: DOI: 10.1103/PhysRevD.78.074008; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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