Rapidity distribution of photons from an anisotropic quark-gluon plasma
- Saha Institute of Nuclear Physics 1/AF Bidhannagar, Kolkata 700064 (India)
We calculate rapidity distribution of photons due to Compton and annihilation processes from quark gluon plasma with pre-equilibrium momentum-space anisotropy. We also include contributions from hadronic matter with late-stage transverse expansion. A phenomenological model has been used for the time evolution of hard momentum scale, p{sub hard}(tau), and anisotropy parameter, xi(tau). As a result of pre-equilibrium momentum-space anisotropy, we find significant modification of photons rapidity distribution. For example, with the fixed initial condition (FIC) free-streaming (delta=2) interpolating model we observe significant enhancement of photon rapidity distribution at fixed p{sub T}, where as for FIC collisionally broadened (delta=2/3) interpolating model the yield increases till yapprox1. Beyond that suppression is observed. With fixed final multiplicity (FFM) free-streaming interpolating model we predict enhancement of photon yield which is less than the case of FIC. Suppression is always observed for FFM collisionally broadened interpolating model.
- OSTI ID:
- 21389044
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 81, Issue 5; Other Information: DOI: 10.1103/PhysRevC.81.054904; (c) 2010 The American Physical Society; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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