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The European Physical Journal A

, Volume 31, Issue 4, pp 626–629 | Cite as

Nucleon sigma term and quark condensate in nuclear matter

  • K. TsushimaEmail author
  • K. Saito
  • A. W. Thomas
  • A. Valcarce
QNP 2006

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.

PACS.

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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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2007

Authors and Affiliations

  • K. Tsushima
    • 1
    Email author
  • K. Saito
    • 2
  • A. W. Thomas
    • 3
  • A. Valcarce
    • 1
  1. 1.Universidad de SalamancaSalamancaSpain
  2. 2.Tokyo University of ScienceNodaJapan
  3. 3.Jefferson LabNewport NewsUSA

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