Vector mesons in a hot pion gas
نویسندگان
چکیده
Previous selfconsistent approximation studies [1, 2] for the description of hadrons in hot and dense matter were extended along several lines [3, 4]. These concern the inclusion of the real parts of all polarisation functions by appropriately subtracted dispersion relations and of RPA-type π-ρ – meson correlations, which also lead to corresponding vertex corrections. Thus we arrive at a system of coupled Dyson equations
منابع مشابه
ar X iv : n uc l - th / 0 41 00 65 v 2 1 0 Fe b 20 06 D mesons and charmonium states in hot pion matter
We calculate the in-medium D meson self-energies in a hot pion gas induced by resonance interactions with pions. The appropriate resonances in the s, p and d waves of the D meson-pion pair are represented by low lying scalar, vector and tensor D∗ mesons. At temperatures around 200 MeV the D-meson mass drops by 30 MeV and the scattering width grows up to 60 MeV. Similar medium effects are found ...
متن کاملVector Manifestation in Hot Matter and Violation of Vector Dominance
We summarize main mechanisms to realize the vector manifestation (VM), in which the massless vector meson becomes the chiral partner of pion, at the critical temperature in hot QCD within the framework of the model based on the hidden local symmetry. Then, we show a recent analysis on the direct photon-π-π coupling which measures the validity of the vector dominance (VD) of the electromagnetic ...
متن کاملSuppression of dilepton production in hot hadronic matter.
The pion electromagnetic form factor at finite temperature is studied using an effective chiral lagrangian that includes explicitly vector mesons. We find that in the time-like region around the rho meson resonance it decreases with increasing temperature and leads to a suppression of dilepton production from pion-pion annihilation in a hot hadronic matter. Effects on dilepton production in hig...
متن کاملDi-electron reconstruction with CBM
A strong excess of dilepton pairs over the yield expected from neutral meson decays was observed by hitherto existing high energy heavy-ion dilepton experiments (CERES, NA60, PHENIX). It is expected that electromagnetic radiation from the dense phase of the collision appears at low transverse momentum: pion-pion fusion, being the dominant process for populating ρ-like states in a hot pion gas, ...
متن کاملFormulation of Vector Manifestation in Hot and / or Dense Matter
The vector manifestation (VM) was proposed as a novel manifestation of chiral symmetry in which the massless vector meson becomes the chiral partner of pion. In this write-up, I briefly summarize the following main ingredients to formulate the VM in hot and/or dense matter: Effective field theory (EFT) based on the hidden local symmetry; Wilsonian matching between the EFT and QCD; Intrinsic the...
متن کامل