Medium effect on photon production in ultrarelativistic nuclear collisions

Details Medium effect on photon production in ultrarelativistic nuclear collisions Medium effect on photon production in ultrarelativistic nuclear collisions

1998-02-23

arxiv.org/abs/nucl-th/9802068v1

Phys.Rev.C58:1689-1697,1998

Physics

Nuclear Physics

Nuclear Theory

21 pages, REVTEX + 9 figures (ps file)

Scientific paper

10.1103/PhysRevC.58.1689

The effect of in-medium vector and axial-vector meson masses on photon production is studied. We assume that the effective mass of a vector meson in hot nuclear matter decreases according to a universal scaling law, while that of an axial-vector meson is given by Weinberg's mass formula. We find that the thermal production rate of photons increases with reduced masses, and is enhanced by an order of magnitude at T=160 MeV with $m_\rho=300$ MeV. Assuming a hydrodynamic evolution, we estimate the effect of the reduced masses on photon production in nucleus-nucleus collisions. The result is compared to experimental data from the WA80/WA98 collaboration.

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