Photons from anisotropic quark-gluon plasma
- Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700 064 (India)
We calculate medium photons due to Compton and annihilation processes in an anisotropic media. The effects of time-dependent momentum-space anisotropy of quark-gluon plasma (QGP) on the medium photon production are discussed. Such an anisotropy can result from the initial rapid longitudinal expansion of the matter, created in relativistic heavy ion collisions. A phenomenological model for the time-dependence of the parton hard momentum scale, p{sub hard}({tau}), and anisotropy parameter, {xi}({tau}), has been used to describe the plasma space-time evolution. We find significant dependency of photon yield on the isotropization time ({tau}{sub iso}). It is shown that the introduction of early time momentum-space anisotropy can enhance the photon production by a factor of 10(1.5) (in the central rapidity region) for the free streaming (collisionally-broadened) interpolating model if we assume fixed initial condition. On the other hand, enforcing the fixed final multiplicity significantly reduces the enhancement of medium photon production.
- OSTI ID:
- 21199451
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 78, Issue 6; Other Information: DOI: 10.1103/PhysRevC.78.064904; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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