Constraints on hyperon couplings from neutron star equations of state¤

Based on the constituent quark picture of baryons and taking into account the contributions of isovector and strange mesons, we have developed the extended Zimanyi-Moszkowski model of dense baryon matter for studying neutron star (NS) equations of state (EOSs). Four sets of meson-hyperons coupling constants are investigated. The …rst is characterized by strong attractive § interaction while the others have repulsive § interactions. The second is characterized by strong attractive ¤¤ interaction. The third has weak ¤¤ but strong attractive §§ interactions. The last one has much weaker §§ interaction than the third one. By systematic analyses of the EOSs and mass sequences of NSs, it has been found that the strong attractive §, ¤¤ and §§ interactions are ruled out. The result is consistent to the most recent information on hyperon interactions from the experimental and theoretical investigations of hypernuclei.