Pion-nucleon Sigma Term in the Global Color Model of QCD

Details Pion-nucleon Sigma Term in the Global Color Model of QCD Pion-nucleon Sigma Term in the Global Color Model of QCD

2005-08-18

arxiv.org/abs/hep-ph/0508192v2

Phys.Rev. D72 (2005) 094023

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 3 figures

Scientific paper

10.1103/PhysRevD.72.094023

We study the pion-nucleon sigma term in vacuum and in nuclear matter in the framework of global color model of QCD. With the effective gluon propagator being taken as the $\delta$-function in momentum space of Munczek-Nomirovsky model, we estimate that the sigma term at chiral limit in the vacuum is 9/2 times the current quark mass and it decreases with the nuclear matter density. With the presently obtained in-medium pion-nucleon sigma term, we study the in-medium chiral quark condensate and obtain a reasonable variation behavior against the nuclear matter density.

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