B --> pi and B --> K transitions in partially quenched chiral perturbation theory

Abstract

We study the properties of the B-->pi and B-->K transition form factors in partially quenched QCD by using the approach of partially quenched chiral perturbation theory combined with the static heavy quark limit. We show that the form factors change almost linearly when varying the value of the sea quark mass, whereas the dependence on the valence quark mass contains both the standard and chirally divergent (quenched) logarithms. A simple strategy for the chiral extrapolations in the lattice studies with Nsea=2 is suggested. It consists of the linear extrapolations from the realistically accessible quark masses, first in the sea and then in the valence quark mass. From the present approach, we estimate the uncertainty induced by such extrapolations to be within 5%.

Published version

References in corpus (4)

• Light hadron spectroscopy with two flavors of $O(a)$-improved dynamical quarks
• Chiral corrections and lattice QCD results for fBs/fBd and (Delta ms/Delta md)
• B-->pi and B-->K transitions in standard and quenched chiral perturbation theory
• Semileptonic B Decays from an NRQCD/D234 Action

Cited by in corpus (18)

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• $D\to K,l\nu$ Semileptonic Decay Scalar Form Factor and $|V_{cs}|$ from Lattice QCD
• Theoretical estimate of the $D^{\ast }\to D\pi$ decay rate
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