4,212 research outputs found

    Heavy Scalar, Vector and Axial-Vector Mesons in Hot and Dense Nuclear Medium

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    In this work we shall investigate the mass modifications of scalar mesons (D0,B0)\left( D_{0}, B_{0}\right),vector mesons (D,B)\left( D^{\ast}, B^{\ast}\right) and axial-vector mesons (D1,B1)\left(D_{1}, B_{1}\right) at finite density and temperature of the nuclear medium. The above mesons are modified in the nuclear medium through themodification of quark and gluon condensates. We shall find the medium modification of quark and gluon condensates within chiral SU(3) model through the medium modification of scalar-isoscalar fields σ\sigma and ζ\zeta at finite density and temperature. These medium modified quark and gluon condensates will further be used through QCD sum rules for the evaluation of in-medium properties of above mentioned scalar, vector and axial vector mesons. We shall also discuss the effects of density and temperature of the nuclear medium on the scattering lengths of above scalar, vector and axial-vector mesons. The study of the medium modifications of above mesons may be helpful for understanding their production rates in heavy-ion collision experiments. The results of present investigations of medium modifications of scalar, vector and axial-vector mesons at finite density and temperature can be verified in the Compressed Baryonic Matter (CBM) experiment of FAIR facility at GSI, Germany.Comment: 35 pages, 11 figure

    D-mesons and charmonium states in hot isospin asymmetric strange hadronic matter

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    We study the properties of DD and Dˉ\bar{D} mesons in hot isospin asymmetric strange hadronic matter, arising due to their interactions with the hadrons in the hyperonic medium. The interactions of DD and Dˉ\bar{D} mesons with these light hadrons are derived by generalizing the chiral SU(3) model used for the study of hyperonic matter to SU(4). We also study the mass modifications of the charmonium states J/ψJ/\psi, ψ(3686)\psi(3686) and ψ(3770)\psi(3770) in the isospin asymmetric strange hadronic matter at finite temperatures and investigate the possibility of the decay of the charmonium states into DDˉD\bar D pairs in the hot hadronic medium. The mass modifications of these charmonium states arise due to their interaction with the gluon condensates of QCD, simulated by a scalar dilaton field introduced to incorporate the broken scale invariance of QCD within the effective chiral model. We also compute the partial decay widths of the charmonium states to the DDˉD\bar {D} pairs in the hadronic medium. The strong dependence on density of the in-medium properties of the DD, Dˉ\bar{D} and the charmonium states, as well as the partial decay widths of charmonium states to DDˉD\bar {D} pairs, found in the present investigation, will be of direct relevance in observables like open charm enhancement as well as J/ψJ/\psi suppression in the compressed baryonic matter (CBM) experiments at the future Facility for Antiproton and Ion Research, GSI, where the baryonic matter at high densities is planned to be produced.Comment: Accepted for publication in Eur.Phys.Jour. A. Substantially more work has been done and the manuscript has been modified with addition of a new section and new figure