Nucleon sigma term and quark condensate in nuclear matter |
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Authors: | K Tsushima K Saito A W Thomas A Valcarce |
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Institution: | (1) Universidad de Salamanca, E-37008 Salamanca, Spain;(2) Tokyo University of Science, 278-8510 Noda, Japan;(3) Jefferson Lab, 12000 Jefferson Avenue, 23606 Newport News, VA, USA |
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Abstract: | 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 σ 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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Keywords: | 24 85 +p Quarks gluons and QCD in nuclei and nuclear processes 11 30 Rd Chiral symmetries 21 65 +f Nuclear matter |
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