Nucleon sigma term and quark condensate in nuclear matter

Details Nucleon sigma term and quark condensate in nuclear matter Nucleon sigma term and quark condensate in nuclear matter

2006-08-27

arxiv.org/abs/nucl-th/0608062v2

Eur.Phys.J.A31:626-629,2007

Physics

Nuclear Physics

Nuclear Theory

Abstract changed, version accepted for publication in EPJA, 3 pages, 2 figures, EPJ style, talk given at QNP06, June 5 - June

Scientific paper

10.1140/epja/i2006-10179-4

We study the bound nucleon sigma term and the quark condensate in nuclear matter. In the quark-meson coupling (QMC) model the nuclear correction to the sigma term is small and negative, i.e., it decelerates the decrease of the quark condensate in nuclear matter. However, the quark condensate in nuclear matter is controlled primarily by the scalar-isoscalar $\sigma$ field. Compared to the leading term, it moderates the decrease more than that of the nuclear sigma term alone at densities around and larger than the normal nuclear matter density.

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