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arXiv · 0907.5573

Modification of jet-like correlations in Pb-Au at the SPS

Harald Appelshauser·Stefan Kniege
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Abstract

A high statistics study of high-$p_t$ two-particle azimuthal correlations in Pb-Au at $\sqrt{s_{\rm NN}}=17.2$ GeV, performed by the CERES experiment at the CERN-SPS, is presented. A broad away-side correlation with significant dip at $Δϕ\approxπ$ is observed. The shape and magnitude of the correlation is similar to measurements at RHIC. In comparison to PYTHIA calculations, we observe a significant excess of soft particles at the away-side. A study of charge correlations between trigger and associated particles disfavors vacuum fragmentation of the away-side jet and suggests significant energy transfer of the hard-scattered parton to the medium.

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Harald Appelshauser, Stefan Kniege. 2009-07-31. Modification of jet-like correlations in Pb-Au at the SPS. https://doi.org/10.1016/j.nuclphysa.2009.10.137

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