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Because of the rapidly falling particle spectrum at large $p_T$ from jetfragmentation at the CERN SPS energy, the high-$p_T$ hadron distribution shouldbe highly sensitive to parton energy loss inside a dense medium as predicted byrecent perturbative QCD (pQCD) studies. A careful analysis of recent data fromCERN SPS experiments via pQCD calculation shows little evidence of energy loss.This implies that either the life-time of the dense partonic matter is veryshort or one has to re-think about the problem of parton energy loss in densematter. 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 theazimuthal angle is proposed to further clarify this issue.Comment: 4 pages with 2 ps figures. Minors changes are made in the text with  updated references. Revised version to appear in Phys. Rev. Letter

physical review letters

Where Is the Jet Quenching in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>P</mml:mi><mml:mi>b</mml:mi><mml:mo>+</mml:mo><mml:mi>P</mml:mi><mml:mi>b</mml:mi></mml:math>Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>158</mml:mn><mml:mi mathvariant="italic">A</mml:mi><mml:mi /><mml:mi mathvariant="normal">GeV</mml:mi></mml:math>?

Where Is the Jet Quenching inPb+PbCollisions at158AGeV?