2008/07/01 by J. O. Eeg, Jan O. Eeg, Svjetlana Fajfer +1
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-lat #hep-ph
paper · pdf · doi:10.1103/physrevd.78.074008
published as Phys.Rev.D78:074008,2008 · 5 pages, 3 figures
arxiv created 2008/07/01 · openalex publication_date 2008/10/07 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We consider chiral loop corrections to the scalar form factor in Bq\ensuremath→Dql\ensuremathν decays. First we consider chiral corrections to the 1/mQ 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*\ensuremath→D* matrix element on the lattice can be used to determine all the necessary 1/mQ suppressed contributions to the scalar form factor in B\ensuremath→D transitions. In the case of (Bs\ensuremath→Ds)/(B\ensuremath→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/mQ 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 Bq\ensuremath→Dql\ensuremathν decays.