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A study on the anomaly of p over  ratios in Au + Au collisions with jet quenching

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The ratios of p/ at large transverse momentum in central Au + Au collisions at RHIC are studied in the framework of jet quenching based on a next-to-leading order pQCD parton model. It is shown that theoretical calculations with a gluon energy loss larger than the quark energy loss will naturally lead to smaller p/ ratios at large transverse momentum in Au + Au collisions than those in p + p collisions at the same energy. Scenarios with equal energy losses for gluons and quarks and a strong jet conversion are both explored and it is demonstrated that in both scenarios p/ ratios at high pT in central Au + Au collisions are enhanced and the calculated ratios of protons over pions approach the experimental measurements. However, &{\bar{p}}/p; in the latter scenario is found to fit data better than that in the former scenario.

Document Type: Research Article


Publication date: January 1, 2010


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