In-medium kaon and antikaon properties in the quark-meson coupling model

• Published in: Physics letters. B Vol. 429; no. 3; pp. 239 - 246
• Main Authors: Tsushima, K., Saito, K, Thomas, A.W, Wright, S.V
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 18.06.1998
• Subjects: Effective mass; In-medium kaon and antikaon properties; Kaon condensation; Neutron star; The quark-meson coupling model; 71.25J; 13.75J; Neutron star; 12.39.B; Kaon condensation; 21.65; The quark-meson coupling model; In-medium kaon and antikaon properties; Effective mass; 14.40
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/S0370-2693(98)00488-2

The properties of the kaon, K, and antikaon, K ̄ , in nuclear medium are studied in the quark-meson coupling (QMC) model. Employing a constituent quark-antiquark (MIT bag model) picture, their excitation energies in a nuclear medium at zero momentum are calculated within mean field approximation. The scalar, and the vector mesons are assumed to couple directly to the nonstrange quarks and antiquarks in the K and K ̄ mesons. It is demonstrated that the ρ meson induces different mean field potentials for each member of the isodoublets, K and K ̄ , when they are embedded in asymmetric nuclear matter. Furthermore, it is also shown that this ρ meson potential is repulsive for the K − meson in matter with a neutron excess, and renders K − condensation less likely to occur.