Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Where is the jet quenching in Pb+Pb collisions at 158 AGeV?   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.

1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin