Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-07-21
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages, 18 eps figures, Accepted for publication in Physical Review C
Scientific paper
We calculate rapidity distribution of photons due to Compton and annihilation processes from {\em Quark Gluon Plasma} (QGP) 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 $p_{\rm hard}(\tau)$ 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 {\em fixed initial condition} (FIC) {\em free-streaming} ($\delta=2$) interpolating model we observe significant enhancement of photon rapidity distribution at fixed $p_T$, where as for FIC {\em collisionally-broadened} ($\delta=2/3$) interpolating model the yield increases till $y \sim 1$. Beyond that suppression is observed. With {\em fixed final multiplicity} (FFM) {\em free-streaming} interpolating model we predict enhancement of photon yield which is less than the case of FIC. Suppression is always observed for FFM {\em collisionally-broadened} interpolating model.
Bhattacharya Lusaka
Roy Pradip
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