Nucleon Sigma Term and In-medium Quark Condensate in the Modified Quark-Meson Coupling Model

Details Nucleon Sigma Term and In-medium Quark Condensate in the Modified Quark-Meson Coupling Model Nucleon Sigma Term and In-medium Quark Condensate in the Modified Quark-Meson Coupling Model

Publishing date

1997-09-30

URL

arxiv.org/abs/nucl-th/9709074v2

Journals

Mod.Phys.Lett. A14 (1999) 289-298

Science

Physics

Field

Nuclear Physics

SubField

Nuclear Theory

Additional info

9 pages, modified version to be published

Type

Scientific paper

Digital Object Identifier

10.1142/S021773239900033X

Abstract

We evaluate the nucleon sigma term and in-medium quark condensate in the modified quark-meson coupling model which features a density-dependent bag constant. We obtain a nucleon sigma term consistent with its empirical value, which requires a significant reduction of the bag constant in the nuclear medium similar to those found in the previous works. The resulting in-medium quark condensate at low densities agrees well with the model independent linear order result. At higher densities, the magnitude of the in-medium quark condensate tends to increase, indicating no tendency toward chiral symmetry restoration.

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