Quark Loop Effects in Semileptonic Form Factors for Heavy-Light Mesons

TL;DR

This study investigates how dynamical quark loops influence semileptonic form factors in heavy-light meson decays using full QCD simulations, highlighting measurable effects of quark loops.

Contribution

It compares quenched and dynamical QCD simulations to assess the impact of dynamical quark loops on form factors in heavy-light meson decays.

Findings

Dynamical quark loops cause a measurable enhancement in the form factor.

Preliminary results show differences between quenched and dynamical simulations.

Results are uncorrected by continuum matching factors.

Abstract

We present preliminary results of a determination of the semileptonic form factor for the decay of pseudoscalar heavy-light mesons to pseudoscalar light-light mesons in full QCD. In this preliminary study we focus on the effects of dynamical quark loops. Accordingly, we compare results of simulations with matched quenched and Asqtad dynamical gauge configurations. The latter include three flavors of light quarks. Our simulation uses clover Wilson valence quarks, treated in the Fermilab formalism. Preliminary results, as yet uncorrected by continuum matching factors, suggest a measurable enhancement in the form factor due to dynamical quark loops over the accessible range of $q^2$.