Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1997-06-26
Nucl.Phys. A632 (1998) 153-170
Physics
Nuclear Physics
Nuclear Theory
RevTeX, 21 pages, including 13 postscript figures
Scientific paper
10.1016/S0375-9474(97)00808-7
Single photon spectra in heavy-ion collisions at SPS energies are studied in the relativistic transport model that incorporates self-consistently the change of hadron masses in dense matter. We separate the total photon spectrum into `background' arising from the radiative decays of $\pi^0$ and $\eta$ mesons, and the `themal' one from other sources. For the latter we include contributions from radiative decays of $\rho$, $\omega$, $\eta'$, and $a_1$, radiative decays of baryon resonances, as well as two-body processes such as $\pi\pi \to \rho\gamma$ and $\pi\rho \to \pi\gamma$. It is found that more than 95% of all photons come from the decays of $\pi^0$ and $\eta$ mesons, while the thermal photons account for less than 5% of the total photon yield. The thermal photon spectra in our calculations with either free or in-medium meson masses do not exceed the upper bound set by the experimental measurment of the WA80 Collaboration.
Brown Gerald E.
Li Gu-Qiang
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