Chiral condensates and size of the sigma term

Details Chiral condensates and size of the sigma term Chiral condensates and size of the sigma term

2004-12-28

arxiv.org/abs/nucl-th/0412105v1

Nucl.Phys. A747 (2005) 75-83

Physics

Nuclear Physics

Nuclear Theory

11 pages, 1 figure, elsart style

Scientific paper

10.1016/j.nuclphysa.2004.09.058

The in-medium chiral condensate is studied with a new approach which has the advantage of no need for extra assumptions on the current mass derivatives of model parameters. It is shown that the pion-nucleon sigma term is 9/2 times the average current mass of light quarks, if quark confinement is linear. Considering both perturbative and non-perturbative interactions, the chiral condensate decreases monotonously with increasing densities, approaching to zero at about 4 fm^{-3}.

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