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

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

2002-10-25

arxiv.org/abs/hep-lat/0210048v3

Phys.Rev. D67 (2003) 054010

Physics

High Energy Physics

High Energy Physics - Lattice

33 pages, 8 PostScript figures, version to appear in PRD

Scientific paper

10.1103/PhysRevD.67.054010

We study the effects of chiral logs on the heavy-->light pseudoscalar meson transition form factors by using standard and quenched chiral perturbation theory combined with the static heavy quark limit. The resulting expressions are used to indicate the size of uncertainties due to the use of the quenched approximation in the current lattice studies. They may also be used to assess the size of systematic uncertainties induced by missing chiral log terms in extrapolating toward the physical pion mass. We also provide the coefficient multiplying the quenched chiral log, which may be useful if the quenched lattice studies are performed with very light mesons.

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