Bochum 2009 – scientific programme
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HK: Fachverband Hadronen und Kerne
HK 55: Heavy Ion Collisions and QCD phases
HK 55.4: Talk
Wednesday, March 18, 2009, 17:45–18:00, H-ZO 10
Proton-Lambda correlations in central Pb+Pb collisions at 158A GeV — •Hans Beck1, Julian Book1, Christoph Blume1, Volker Friese2, Marek Gazdzicki1, Claudia Höhne2, Dmytro Kresan2, Michael Mitrovski1, Moritz Pohl1, Rainer Renfordt1, Tim Schuster1, Reinhard Stock1, Herbert Ströbele1, and Milica Utvić1 — 1Fachbereich Physik der Universität, Frankfurt — 2Helmholtzzentrum für Schwerionenforschung (GSI), Darmstadt
Proton-Lambda correlations at small momentum differences allow to extract source sizes in nuclear collisions. In contrast to pp correlations, which are widely used in heavy ion physics, the correlation function in the pΛ case is not influenced by Coulomb interactions and quantum correlations. Thus the short-range pΛ correlations are solely affected by the final-state strong interactions and therefore it has been suggested that they provide a higher sensitivity for larger source radii [1].
In this contribution pΛ correlations are analyzed using 2.6 · 106 central (23%) Pb+Pb collisions at 158A GeV registered by NA49 at the CERN SPS. Preliminary results on the measured correlation function have already been shown by the NA49 collaboration [2]. Here, we will report on results of an improved analysis. Comparisons to the former analysis of NA49, model predictions and other measurements (e.g. [3]) will be presented.
[1] F. Wang and S. Pratt, Phys. Rev. Lett. 83, 3138 (1999).
[2] C. Blume et al. (NA49), Nucl. Phys. A715, 55 (2003).
[3] J. Adams et al. (STAR), Phys. Rev. C74, 64906 (2006).