Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-01-07
J.Phys.G37:105010,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 pages, 11 eps figures, Accepted for publication in Journal of Physics G
Scientific paper
10.1088/0954-3899/37/10/105010
We calculate the $p_T$ distributions of jet conversion photons from {\em Quark Gluon Plasma} with pre-equilibrium momentum-space anisotropy. 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 the jet conversion photon $p_T$ distribution. For example, with {\em fixed initial condition} (FIC) pre-equilibrium anisotropy, we predict significant enhancement of the jet-photon $p_T$ distribution in the entire region, whereas for pre-equilibrium anisotropy with {\em fixed final multiplicity} (FFM), suppression of the jet conversion photons $p_T$ distribution is observed. The results with FFM (as it is the most realistic situation) have been compared with high $p_T$ PHENIX photon data. It is found that the data is reproduced well if the isotropization time lies within $1.5$ fm/c.
Bhattacharya Lusaka
Roy Pradip
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