Heavy meson chiral perturbation theory in finite volume

Abstract

We study finite volume effects in heavy quark systems in the framework of heavy meson chiral perturbation theory for full, quenched, and partially quenched QCD. A novel feature of this investigation is the role played by the scales Delta and delta_s, where Delta is the mass difference between the heavy-light vector and pseudoscalar mesons of the same quark content, and delta_s is the mass difference due to light flavour SU(3) breaking. The primary conclusion of this work is that finite volume effects arising from the propagation of Goldstone particles in the effective theory can be altered by the presence of these scales. Since Delta varies significantly with the heavy quark mass, these volume effects can be amplified in both heavy and light quark mass extrapolations (interpolations). As an explicit example, we present results for B parameters of neutral B meson mixing matrix elements and heavy-light decay constants to one-loop order in finite volume heavy meson chiral perturbation theory for full, quenched, and N_f=2+1 partially quenched QCD. Our calculation shows that for high-precision determinations of the phenomenologically interesting SU(3) breaking ratios, finite volume effects are significant in quenched and not negligible in partially quenched QCD, although they are generally small in full QCD.

arXiv comment21 pages, 11 figures; minor changes, version to appear in PRD

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