Photon Rates for Heavy-Ion Collisions from Hidden Local Symmetry

Details Photon Rates for Heavy-Ion Collisions from Hidden Local Symmetry Photon Rates for Heavy-Ion Collisions from Hidden Local Symmetry

1997-12-02

arxiv.org/abs/nucl-th/9712006v2

Phys.Rev.C58:365-375,1998

Physics

Nuclear Physics

Nuclear Theory

12 pages, 12 Postscript figures; discussion of thermal equilibrium rates expanded, minor corrections to text and graphs

Scientific paper

10.1103/PhysRevC.58.365

We study photon production from the hidden local symmetry approach that includes pions, rho and a1 mesons and compute the corresponding photon emission rates from a hadronic gas in thermal equilibrium. Together with experimental radiative decay widths of the background, these rates are used in a relativistic transport model to calculate single photon spectra in heavy-ion collisions at SPS energies. We then employ this effective theory to test three scenarios for the chiral phase transition in high-temperature nuclear matter including decreasing vector meson masses. Although all calculations respect the upper bound set by the WA80 Collaboration, we find the scenarios could be distinguished with more detailed data.

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