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Photons from Quark and Hadron Phases in Au + Au Collisions |
| LONG Jia-Li1, HE Ze-Jun1,2,3, MA Yu-Gang1,2, GUAN Na-Na1 |
| 1Shanghai Institute of Applied Physics, Chinese Academy of Sciences, PO Box 800-204, Shanghai 2018002CCAST (World Laboratory), PO Box 8730, Beijing 1000803Research Center of Nuclear Theory of National Laboratory of Heavy Ion Accelerator, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 |
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| Cite this article: |
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LONG Jia-Li, HE Ze-Jun, MA Yu-Gang et al 2008 Chin. Phys. Lett. 25 3188-3191 |
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Abstract Based on a relativistic hydrodynamic model describing the evolution of the chemically equilibrating quark--gluon plasma system with finite baryon density in a 3+1-dimensional spacetime, we compute photons from the quark phase, hadronic phase and initial non-thermal contributions. It is found that due to the effects of the initial quark chemical potential, chemical equilibration and rapid expansion of the system, the photon yield of the quark--gluon plasma is strongly suppressed, and photons from hadronic matter and initial non-thermal contributions almost reproduce experimental data.
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| Keywords:
12.38.Mh
25.75.Dw
24.10.Nz
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Received: 05 April 2008
Published: 29 August 2008
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