Volume Dependence of the Pion Mass in the Quark-Meson-Model

Details Volume Dependence of the Pion Mass in the Quark-Meson-Model Volume Dependence of the Pion Mass in the Quark-Meson-Model

2004-08-09

arxiv.org/abs/hep-ph/0408116v2

Phys.Rev. D71 (2005) 014032

Physics

High Energy Physics

High Energy Physics - Phenomenology

28 pages, 5 figures, v2: minor changes, references updated, final version published in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.71.014032

We consider the quark-meson-model in a finite three-dimensional volume using the Schwinger proper-time renormalization group. We derive and solve the flow equations for finite volume in local potential approximation. In order to break chiral symmetry in the finite volume, we introduce a small current quark mass. The corresponding effective meson potential breaks chiral O(4) symmetry explicitly, depending on sigma and pion fields separately. We calculate the volume dependence of the pion mass and of the pion decay constant with the renormalization group flow equations and compare with recent results from chiral perturbation theory in a finite volume.

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