Darmstadt 2008 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 39: Physik mit schweren Ionen

HK 39.6: Vortrag

Donnerstag, 13. März 2008, 18:15–18:30, 2E

Angular momentum correlations of D-Dpairs as a sensitive probe for thermalization — •Georgios Tsiledakis for the ALICE-TRD collaboration — Physiaklisches Institut, Heidelberg

In high-energy nuclear collisions at LHC, where a QGP might be created, the degree of thermalization is a key issue since it is closely related to the partonic equation of state. Due to their large mass, heavy quarks are a good probe for thermalization. Thus, we propose to measure azimuthal correlations of heavy-quark hadrons. Simulations with PYTHIA for p-p collisions at 14 TeV have been performed using the momentum covariance ⟨ p_T^D,p_T^D⟩ as a clean measure for angular correlations. Results show that initially D-D pairs are produced with a strong back-to-back correlation. A modification or even a complete abscence of these correlations in Pb-Pb collisions would indicate thermalization at the partonic level. Finally, the contribution of the elliptic and radial flow and predictions for the ALICE experiment at CERN are discussed.