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

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.

9 pages, modified version to be published

References in corpus (3)

• A quark-meson model for nuclear and neutron matter
• QCD Sum Rules and Applications to Nuclear Physics
• Recovering Relativistic Nuclear Phenomenology from the Quark-Meson Coupling Model

Cited by in corpus (1)

• Chiral condensate in nuclear matter with vacuum corrections