Where is the jet quenching in Pb+Pb collisions at 158 AGeV?

Details Where is the jet quenching in Pb+Pb collisions at 158 AGeV? Where is the jet quenching in Pb+Pb collisions at 158 AGeV?

1998-04-24

arxiv.org/abs/hep-ph/9804384v2

Phys.Rev.Lett. 81 (1998) 2655-2658

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages with 2 ps figures. Minors changes are made in the text with updated references. Revised version to appear in Phys. Rev

Scientific paper

10.1103/PhysRevLett.81.2655

Because of the rapidly falling particle spectrum at large $p_T$ from jet fragmentation at the CERN SPS energy, the high-$p_T$ 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 $Pb+Pb$ collisions at the CERN SPS. High-$p_T$ two particle correlation in the azimuthal angle is proposed to further clarify this issue.

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