Two-photon decays of vector mesons and dilepton decays of scalar mesons in dense matter

Abstract

Two-photon decays of vector mesons and dilepton decays of scalar mesons which are forbidden in vacuum and can occur in dense baryonic matter due to the explicit violation of Lorentz symmetry are described within a quark model of the Nambu--Jona-Lasinio type. The temperature and chemical potential dependence of these processes is investigated. It is found that their contribution to the production of photons and leptons in heavy-ion collisions is enhanced near the conditions corresponding to the restoration of chiral symmetry. Moreover, in the case of the a_0 meson and especially the ρ-meson, a resonant behaviour (an additional amplification) is observed due to the degeneration of ρand a_0 masses when a hot hadron matter is approaching a chirally symmetric phase.

arXiv comment20 figures, IOP style

References in corpus (11)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Chiral Restoration in Hot and/or Dense Matter
• e+e--pair production in Pb-Au collisions at 158 GeV per nucleon
• Report from NA49
• Radiative decays of ϕ-meson and nature of light scalar resonances
• Scalar mesons in the Nambu--Jona-Lasinio model with 't Hooft interaction
• Excess low energy photon pairs from pion annihilation at the chiral phase transition
• The effects of meson mixing on dilepton spectra
• Sigma-meson in hot and dense matter
• Scalar correlations in a quark plasma and low mass dilepton production
• Pion and Quark Annihilation Mechanisms of Dilepton Production in Relativistic Heavy-Ion Collisions

Cited by in corpus (3)

• Chiral vortaic effect and neutron asymmetries at NICA
• Properties of the light scalar mesons face the experimental data on the $\varphi \to {\pi }^0{\pi }^0\gamma$ decay and the $\pi \pi$ scattering
• Mesons and diquarks in neutral color superconducting quark matter with $\beta$-equilibrium