Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 63: Schwerionenkollisionen und QCD Phasen
HK 63.4: Vortrag
Freitag, 21. März 2014, 14:45–15:00, HZ 6
Proton-Lambda Correlations in Pb-Pb Collisions at √sNN = 2.76 TeV with ALICE — •Hans Beck for the ALICE collaboration — Institut für Kernphysik, Goethe-Universität Frankfurt
Femtoscopic two-particle correlations carry important information about the particle emitting source. Of particular interest is the mT dependence of the extracted source radii, which is introduced by the dynamics of the system created in heavy-ion collisions. The reach in mT of the traditional pion-pion correlation measurements is limited by the small rest mass of the examined particles. Thus, it can be extended with the analysis of pairs of heavier particles, e.g. proton-lambda pairs, being the heaviest system for which source sizes can so far be extracted.
The excellent PID capabilities of ALICE allow to obtain lambda and proton samples with very high purities. The measured proton-lambda correlation functions are affected by feed-down due to weak decays of higher mass baryons. Using data-driven methods, a corresponding correction is applied to the data. This allows to extract radius parameters in several centrality classes and mT intervals at larger mT with high precision.
Supported by BMBF and the Helmholtz Association.