Search for color charge dependence of energy loss at RHIC

Details Search for color charge dependence of energy loss at RHIC Search for color charge dependence of energy loss at RHIC

2007-05-07

arxiv.org/abs/0705.0953v2

Physics

Nuclear Physics

Nuclear Experiment

Prepared for the 23rd Winter Workshop on Nuclear Dynamics, Big Sky, Montana, USA, 11-18 Feb 2007

Scientific paper

The non-Abelian feature of quantum chromodynamics (QCD) results in the gluons losing more energy than quarks in the medium formed in high energy heavy-ion collisions. Experimental results in p+p collisions when compared to NLO pQCD calculations show that at high transverse momentum (pT) the produced protons+anti-protons are dominantly from gluon jets and charged pions have substantial contribution from quark jets. If such a scenario is applied to heavy-ion collisions at RHIC, one would expect the difference in quark and gluon energy loss to have an effect on measured observables, such as high pT pbar(p)/pi ratios and the nuclear modification factor for various particles species. We discuss the experimental results and some possible future measurements.

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