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HK: Fachverband Physik der Hadronen und Kerne

HK 37: Schwerionenkollisionen und QCD Phasen

HK 37.7: Talk

Wednesday, March 21, 2012, 18:15–18:30, P 5

Proton-Lambda Correlations in Pb-Pb Collisions at √s_NN = 2.76 TeV — •Hans Beck — Institut für Kernphysik, Goethe Universität Frankfurt am Main

Proton-lambda correlations at small momentum differences resulting from final-state strong interactions allow to extract source sizes in nuclear collisions [1]. This contribution presents an analysis of pΛ correlations in Pb-Pb collisions at √s_NN = 2.76 TeV registered by ALICE at the CERN LHC. The influence of imperfect particle selection, contributions from decays, finite two track and momentum resolution effects will be discussed. Fully corrected correlation functions will be shown and source sizes will be extracted and be put in the context of other measurements (e.g. [2,3]). The large number of pΛ pairs produced at LHC energies allows for the first time the study of the pΛ correlations as a function of centrality. pΛ correlations extend the ⟨ m_t⟩ reach of extracted source radii and are therefore a good test for hydrodynamics-motivated models - which expect a decrease of the source size as a function of ⟨ m_t⟩ [4].

[1] F. Wang and S. Pratt, Phys. Rev. Lett. 83, 3138 (1999).

[2] T. Anticic et al. (NA49), Phys. Rev. C 83, 054096 (2011).

[3] K. Aamondt et al. (ALICE), Phys. Lett. B 696, 328 (2011).

[4] U. Wiedemann and U. Heinz, Phys. Rep. 319, 145 (1999).