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Abstract: We analyze the photon rates from a hadronic gas in equilibrium using chiralreduction formulas and a density expansion. The chiral reduction is carried tosecond order in the pion density which in principal includes all kineticprocesses of the type $X\to \pi\gamma$ and $X\to \pi\pi\gamma$. The resultingrates are encoded in the form of vacuum correlation functions which areamenable to experiment. The hadronic rates computed in this work along with theknown perturbative QGP rates are integrated over the space-time evolution of ahydrodynamic model tuned to hadronic observables. The resulting yields arecompared to the recent photon and low mass dilepton measurements at the SPS andRHIC. Predictions for the LHC are made.



Autor: Kevin Dusling, Ismail Zahed

Fuente: https://arxiv.org/







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