The nucleon and meson effective masses in the nonlinear Relativistic Mean-Field Theory (RMF) introducing a ω− ρ coupling is explored. It is shown that, in contrast to the usual Walecka model, not only the effective nucleon mass meff,N but also the effective ρ meson mass meff,ρ and the effective ω meson mass meff,ω are nucleon density dependent. PACS numbers: 24.10.Cn, 24.10.Jv, 21.30.Fe Submitt...

By means of a coupled channel non-perturbative unitary approach, it is possible to extend the strong constrains of Chiral Perturbation Theory to higher energies. In particular, it is possible to reproduce the lowest lying resonances in meson-meson scattering up to 1.2 GeV using the parameters of the O(p) and O(p) Chiral Lagrangian. We report on an update of these results examining their possibl...

We investigate the time evolution of the quantum meson modes in the late time of chiral phase transition. In particular, it is shown that there exists a possible solution to the equation of motion for the quantum meson modes, which reveals a parametric resonance and/or resonance through forced oscillation induced by the small oscillation of the chiral condensate. After that, we demonstrate the ...

In these proceedings we concentrate on the refeeding and rescattering probability of hadronic resonances. We discuss the probability to form resonances in binary baryon-meson or meson-meson collisions as a function of time for various resonances using a transport model approach (UrQMD). We give an estimate of the re-feeding probability using a simplified thermal approach and discuss the relevan...

σ L /σ T in the ρ 0-meson diffractive electroproproduction. Abstract The background due to the direct diffractive dissociation of the photon into the π + π −-pair to the " elastic " diffractive ρ 0-meson production in electron-proton collisions is calculated. At large Q 2 the interference between resonant and non-resonant π + π − production changes the σ L /σ T ratio with the mass of the 2π (i....

A bstract We present positivity bounds, derived from the principles of analyticity, unitarity and crossing symmetry, that constrain low-energy constants chiral perturbation theory. Bounds are produced for 2, 3 or more flavours in meson-meson scattering with equal meson masses, up to including next-to-next-to-leading order (NNLO), using second higher derivatives amplitude. enhance bounds by most...

Abstract We discuss the relation between the effective vector meson mass and equation of state (EOS) for nuclear matter. In the mean field approximation, the EOS becomes softer due to the reduction of the effective ω-meson mass, if we assume that the ω-meson mean field is proportional to the baryon density. We examine the assumption by using the auxiliary field method at finite temperature and ...

We analyze the hadronic and radiative decay modes of the recently observed DsJ(2317) meson, in the hypothesis that it can be identifield with the scalar sl = 1 2 + state of cs̄ spectrum (Ds0). The method is based on heavy quark symmetries and Vector Meson Dominance ansatz. We find that the hadronic isospin violating mode Ds0 → Dsπ is enhanced with respect to the radiative mode Ds0 → D∗ sγ. The e...