Bonn 2010 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 2: Schwerionenkollisionen und QCD Phasen I

HK 2.4: Vortrag

Montag, 15. März 2010, 17:30–17:45, HG I

Proton-lambda correlations in central Pb+Pb collisions at 158A GeV — •Hans Beck1, Christoph Blume1, Julian Book1, Volker Friese2, Marek Gazdzicki1, Claudia Höhne2, Dmytro Kresan2, Michael Mitrovski1, Moritz Pohl1, Rainer Renfordt1, Tim Schuster1, Reinhard Stock1, and Herbert Ströbele11Fachbereich Physik der Universität, Frankfurt — 2Helmholtzzentrum für Schwerionenforschung (GSI), Darmstadt

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 using 2.8 · 106 central (23,5%) Pb+Pb collisions at 158A GeV registered by NA49 at the CERN SPS [2]. The effect of background in the particle identification, particle decays, finite two track and momentum resolution will be discussed; fully corrected correlation functions will be shown and a source size will be extracted and be put in the context of other measurements [3,4]. Hydrodynamics-motivated models (e.g. [5]) expect a <mt>−1/2 decrease of the source size. We will compare our result to the correlations of charged kaons and pions measured by NA49, thus checking consistency over a wide range in <mt>.

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

[2] Hans Beck, Diplomarbeit, Universität Frankfurt (2009).

[3] J. Adams et al. (STAR), Phys. Rev. C74, 64906 (2006).

[4] H. Appelshäuser et al. (NA49), Phys. Lett. B467, 21 (1999).

[5] B. Tomášik et al., Nucl Phys A663, 753 (2000).

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