Large angle hadron correlations from medium-induced gluon radiation

Abstract

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 $|\Delta \varphi |\ge \frac{\pi }{2}$ 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.

To appear in the proceedings of the MIT workshop "Correlations and Fluctuations 2005". 10 pages, 5 eps figures

References in corpus (5)

• Measurement of Jet Modification at RHIC
• Indications of suppressed high p_T hadron production in nucleus-nucleus collisions at CERN-SPS
• PHENIX measurement of jet properties and their modification in heavy-ion collisions
• Relevance of baseline hard proton-proton spectra for high-energy nucleus-nucleus physics
• Dihadron correlations at high pT