Scalar susceptibility from the instanton vacuum with meson-loop corrections

Details Scalar susceptibility from the instanton vacuum with meson-loop corrections Scalar susceptibility from the instanton vacuum with meson-loop corrections

2008-10-22

arxiv.org/abs/0810.3984v2

Phys.Rev.D79:014008,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 3 figures, accepted for publication in Phys.Rev.D

Scientific paper

10.1103/PhysRevD.79.014008

The scalar susceptibility (chi_s) of QCD, which represents the response of the chiral condensate to a small perturbation of explicit chiral-symmetry breaking, is investigated within the nonlocal chiral quark model (NLchiQM) based on the instanton vacuum configuration for N_f = 2. We also take into account 1/N_c meson-loop (ML) corrections including scalar and pseudoscalar mesons. It turns out that the chiral condensate is modified to a large extend by the ML corrections in the vicinity of m = 0, whereas its effect becomes weak beyond m ~ 100 MeV. As numerical results, we find that chi_s = -0.34 GeV^2 with the ML corrections and 0.18 GeV^2 without it, respectively. From these observations, we conclude that the ML corrections play an important role in the presence of finite current-quark mass.

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