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HK: Fachverband Hadronen und Kerne

HK 23: Heavy Ion Collisions and QCD phases

HK 23.1: Invited Group Report

Tuesday, March 17, 2009, 14:00–14:30, H-ZO 10

Leptons and heavy mesons - signals from high density/ high temperature matter? — •Joerg Aichelin and Pol-Bernard Gossiaux — Subatech, Nantes,France

Theory predicts that at high density/temperature a plasma of quarks and gluons is created but it is all but easy to find 'smoking gun' signals, experimentally as well as theoretically. The multiplicity and the spectra of most of the hadrons are well described assuming a thermally equilibrated hadron gaz and contain therefore no direct information on the high density/temperature phase. We discuss whether two particles which do not follow this trend, leptons and heavy hadrons (containing either a c or a b quark), give us the desired information. A comparision of the theoretical approaches with present RHIC and future LHC data is presented and the physical consequences are discussed.