Where is the jet quenching in Pb+Pb collisions at 158 AGeV?
Abstract
Because of the rapidly falling particle spectrum at large from jet fragmentation at the CERN SPS energy, the high- hadron distribution should be highly sensitive to parton energy loss inside a dense medium as predicted by recent perturbative QCD (pQCD) studies. A careful analysis of recent data from CERN SPS experiments via pQCD calculation shows little evidence of energy loss. This implies that either the life-time of the dense partonic matter is very short or one has to re-think about the problem of parton energy loss in dense matter. The hadronic matter does not seem to cause jet quenching in collisions at the CERN SPS. High- two particle correlation in the azimuthal angle is proposed to further clarify this issue.
Cite
@article{arxiv.hep-ph/9804384,
title = {Where is the jet quenching in Pb+Pb collisions at 158 AGeV?},
author = {Xin-Nian Wang},
journal= {arXiv preprint arXiv:hep-ph/9804384},
year = {2009}
}
Comments
4 pages with 2 ps figures. Minors changes are made in the text with updated references. Revised version to appear in Phys. Rev. Letters