We study the properties of D andD mesons in hot isospin asymmetric strange hadronic matter, arising due to their interactions with the hadrons in the hyperonic medium. The interactions of D andD mesons with these light hadrons are derived by generalizing the chiral SU(3) model used for the study of hyperonic matter to SU(4). The nucleons, hyperons, the scalar isoscalar meson, σ and the scalar-isovector meson, δ as modified in the strange hadronic matter, modify the masses of D andD mesons. It is found that as compared to theD mesons (D 0 , D − ), the properties of the D mesons (D 0 ,D + ) are more sensitive to the isospin asymmetry at high densities. On the other hand, the effects of strangeness fraction are found to be more dominant for theD mesons as compared to D mesons and these modifications are observed to be particularly appreciable at high densities. We also study the mass modifications of the charmonium states J/ψ, ψ(3686) and ψ(3770) in the isospin asymmetric strange hadronic matter at finite temperatures and investigate the possibility of the decay of the charmonium states into DD 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. The effects of finite quark masses are taken into account in the trace of the energy momentum tensor in QCD, while investigating the medium modification of the charmonium masses through the modification of the gluon condensate in the medium. We also compute the partial decay widths of the charmonium states to the DD pairs in the hadronic medium. The strong dependence on density of the in-medium properties of the D, D and the charmonium states, as well as the partial decay widths of charmonium states to DD pairs, found in the present investigation, will be of direct relevance in observables like open charm enhancement as well as J/ψ 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.

We investigate the in-medium masses of D andD mesons in the isospin-asymmetric nuclear matter at finite temperatures arising due to the interactions with the nucleons, the scalar isoscalar meson σ, and the scalar iso-vector meson δ within a SU(4) model. However, since the chiral symmetry is explicitly broken for the SU(4) case due to the large charm quark mass, we use the SU(4) symmetry here only to obtain the interactions of the D andD mesons with the light hadron sector, but use the observed values of the heavy hadron masses and empirical values of the decay constants. The in-medium masses of J/ψ and the excited charmonium states (ψ (3686) and ψ(3770)) are also calculated in the hot isospin asymmetric nuclear matter in the present investigation. These mass modifications arise due to the interaction of the charmonium states 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. The change in the mass of J/ψ in the nuclear matter with the density is seen to be rather small, as has been shown in the literature by using various approaches, whereas, the masses of the excited states of charmonium (ψ(3686) and

The medium modifications of the energies of kaons and antikaons in isospin asymmetric hyperonic matter are investigated using a chiral SU(3) model. The isospin dependent medium effects, are important for asymmetric heavy ion collision experiments, as well as relevant for the neutron star phenomenology as the bulk matter in the interior of the neutron star is highly isospin asymmetric. The effects of hyperons on the medium modifications of the kaons and antikaons in the strange hadronic matter are investigated in the present work and are seen to be appreciable for hadronic matter with large strangeness fractions. The study of the K-mesons in the asymmetric strange hadronic matter can be especially relevant for the compressed strange baryonic matter which can result from asymmetric heavy ion collision experiments in the future accelerator facility FAIR at GSI. PACS numbers: 24.10.Cn; 24.10.-i; 25.75.-q; 13.75.Jz I. INTRODUCTIONThe topic of study of the in-medium properties of hadrons is an important problem in strong interaction physics, which has relevance in the high energy heavy-ion collision experiments, as well as in neutron star phenomenology. In heavy ion collision experiments, the medium modifications of the hadrons can be seen in different observables, like particle yield, particle spectra as well as in their collective flow. The study of medium modifications of K-mesons were initiated by Kaplan and Nelson [1], who suggested the possibility of antikaon condensation in the interior of the neutron stars due to the drop in the mass of the antikaons in the nuclear medium. However, recent experimental observations on neutron star phenomenology impose constraints on the nuclear equation of state (EOS). The EOS for the nuclear matter obtained using an efective model should be consistent with the astrophysical bounds to be acceptable as an EOS for neutron star matter [2,3]. Recently, the nuclear matter EOS have been investigated consistent with the neutron star phenomenology as well as data for collective flow in heavy ion collision experiments [4]. The in-medium modification of kaon/antikaon properties can be observed experimentally [5,6,7,8,9] in relativistic nuclear collisions from their abundance, spectra as well as collective flow. There have also been intense theoretical investigations [10,11,12,13,14,15,16,17,18,19] on the kaon and antikaon properties in the dense and hot hadronic matter, and to study the effects of such modifications on the observables of the high energy heavy ion collision experiments. Hence there have been extensive research to obtain the in-medium properties of kaons and antikaons due to their relevance for the high energy heavy ion collision epxeriments. These have been calculated by using several methods like extracting from kaonic atom data, using chiral lagrangians or by coupled channel methods [20]. However, the kaon/antikaon potential in the hot and dense hadronic matter remains still an unresolved issue.The isospin effects in hot and dense hadronic matter [22] are important in is...

We study the in-medium masses of the charmonium states J /ψ and η c in the nuclear medium using the QCD sum rule approach. These mass modifications arise owing to modifications of the scalar and the twist-2 gluon condensates in the hot hadronic matter. The scalar gluon condensate αs π G a µν G a µν and the twist-2 tensorial gluon operator αs π G a µσ G a ν σ in the nuclear medium are calculated from the medium modification of a scalar dilaton field introduced to incorporate trace anomalies of QCD within the chiral SU(3) model used in the present investigation. The effects of isospin asymmetry, density, and temperature of the nuclear medium on the in-medium masses of the lowest charmonium states J /ψ and η c mesons are investigated in the present work. The results of the present investigation are compared with the existing results on the masses of these states. The medium modifications of the masses of these charmonium states (J /ψ and η c ) seem to be appreciable at high densities and should modify the experimental observables arising from the compressed baryonic matter produced in asymmetric heavy-ion collision experiments at the future facility of Facility for Antiproton and Ion Research, GSI.

Using QCD sum rules and chiral SU(3) model, we investigate the effect of temperature, density, strangeness fraction and isospin asymmetric parameter on the shift in masses and decay constants of the pseudoscalar D and B meson in hadronic medium, which consist of nucleons and hyperons. The in-medium properties of D and B mesons within QCD sum rule approach depend upon the quark and gluon condensates. In chiral SU(3) model, quark and gluon condensates are introduced through the explicit symmetry breaking term and the trace anomaly property of the QCD, respectively and are written in terms of scalar fields σ, ζ, δ and χ. Hence, through medium modification of σ, ζ, δ and χ fields, we obtain the medium modified masses and decay constants of D and B mesons. As an application, using 3 P 0 model, we calculate the in-medium decay width of the higher charmonium states ψ(3686), ψ(3770) and χ(3556) to the DD pairs, considering the in-medium mass of D mesons. These results may be important to understand the possible outcomes of high energy physics experiments, e.g., CBM and PANDA at GSI, Germany.

The modification on kaon and antikaon properties of in the interior of (proto-)neutron stars is investigated using a chiral SU(3) model. The parameters of the model are fitted to nuclear matter saturation properties, baryon octet vacuum masses, hyperon optical potentials and low energy a kaon-nucleon scattering lengths. We study the kaon/antikaon medium modification and explore the possibility of antikaon condensation in (proto-)neutron star matter at zero as well as finite temperature/entropy and neutrino content. The effect of hyperons on kaon and antikaon optical potentials is also investigated at different stages of the neutron star evolution.

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We observed the impact of finite magnetic field on the in-medium mass and decay constant of isospin averaged vector D * (D * + , D * 0 ) and axial-vector D 1 (D + 1 , D 0 1 ) mesons. The quark and gluon condensates of the nuclear medium at finite magnetic field, temperature, isospin asymmetry, and density have been obtained by the meson exchange scalar fields within the chiral SU(3) model.The medium attributes modify the scalar and vector density of nuclear medium and this variation reflects in the in-medium mass and decay constant of spin 1 D mesons. We calculate these observables by comparing the Operator Product Expansion (OPE) and the phenomenological side in the QCD Sum Rules. In the results, we observed a positive mass shift for charged vector and axial-vector D mesons with respect to magnetic field. For neutral vector (axial-vector) D mesons we observed negative (positive) mass shift as a function of magnetic field. In the application part, we calculate the in-medium partial decay width of the process D * s (2715/2860) → D * K by using 3 P 0 model. The in-medium effects are incorporated through the in-medium masses of