Münster 2002 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 33: Heavy Ions IV

HK 33.5: Talk

Wednesday, March 13, 2002, 15:00–15:15, E

Centrality and Beam Energy Dependence of HBT Correlations at SPS — •Heinz Tilsner and Harald Appelshäuser — Physikalisches Institut der Universität Heidelberg, Philosophenweg 12, D-69120 Heidelberg

The Analysis of Bose-Einstein momentum correlations of identical pions (HBT interferometry) provide an ideal tool to gain insight into the space-time evolution as well as the existence of collective velocity fields at the time of thermal freeze-out of the pion emitting source, created in ultra-relativistic collisions of heavy ions.

The CERES spectrometer was upgraded in 1998 by the addition of a cylindrical Time Projection Chamber (TPC) to improve the momentum resolution. Furthermore, the upgrade also improved substantially the hadron detection capability of the spectrometer and allowed for a systematic investigation of hadronic observables at midrapidity.

We present the centrality and beam energy dependence of two-pion HBT correlations in 40, 80 and 158 AGeV Pb+Au collisions.