Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-06-27
J.Phys.Conf.Ser. 27 (2005) 11-21
Physics
High Energy Physics
High Energy Physics - Phenomenology
To appear in the proceedings of the MIT workshop "Correlations and Fluctuations 2005". 10 pages, 5 eps figures
Scientific paper
10.1088/1742-6596/27/1/002
Final state medium-induced gluon radiation in ultradense nuclear matter is shown to favor large angle emission when compared to vacuum bremsstrahlung due to the suppression of collinear gluons. In a simple model of momentum transfers from the medium to the jet+gluon system the phase space distribution of non-Abelian bremsstrahlung is examined to first order in opacity. Perturbative expression for the contribution of the hadronic fragments from medium-induced gluons to the back-to-back particle correlations is derived. It is found that in the limit of large jet energy loss gluon radiation determines the yield and angular distribution of $|\Delta \phi | \geq \frac{\pi}{2}$ di-hadrons to high transverse momenta $p_{T_2}$ of the associated particles. Clear transition from enhancement to suppression of the away-side di-hadron correlations is established at moderate $p_{T_2}$ and its experimentally accessible features are predicted versus the trigger particle momentum $p_{T_1}$. The measured away-side correlation function is shown to be sensitive to the broad rapidity distribution of di-jets and their vacuum and medium-induced acoplanarity.
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