Heavy--quark momentum correlations as a sensitive probe of thermalization

Details Heavy--quark momentum correlations as a sensitive probe of thermalization Heavy--quark momentum correlations as a sensitive probe of thermalization

2009-03-02

arxiv.org/abs/0903.0366v1

J.Phys.G36:064058,2009

Physics

Nuclear Physics

Nuclear Experiment

proceedings of the SQM2008 conference, Beijing, China, 6 pages, 4 figs., accepted for publication in J. Phys. G

Scientific paper

10.1088/0954-3899/36/6/064058

In high-energy nuclear collisions the degree of thermalization at the partonic level is a key issue. Due to their large mass, heavy-quarks and their participation in the collective flow of the QCD medium constitute a powerful tool to probe thermalization. We propose measuring azimuthal correlations of heavy-quark hadrons and products from their semi-leptonic decay. Modifications or even the complete absence of initially, e.g. in p-p collisions, existing azimuthal correlations in Pb-Pb collisions might indicate thermalization at the partonic level. We present studies with PYTHIA for p-p collisions at the top LHC energy using the two-particle transverse momentum correlator ${<\overline{\Delta}p_{t,1}\overline{\Delta}p_{t,2}>}$ as a sensitive measure of azimuthal correlations.

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