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HK: Physik der Hadronen und Kerne
HK 43: Theorie VIII
HK 43.4: Talk
Thursday, March 22, 2001, 16:00–16:15, B
Antihyperon-Production in Relativistic Heavy Ion Collision — •carsten greiner and stefan leupold — Institut fuer Theoretische Physik, Universitaet Giessen
Enhanced antihyperon production, as observed at CERN SPS, is regarded as one of the experimentally obtained cornerstones for the formation of a new state of matter, the quark gluon plasma. We show, however, that antihyperons are driven towards local chemical equilibrium with pions, nucleons and kaons on a timescale of 1–2 fm/c when considering the inverse channel of hadronic annihilation reactions like Ȳ+p ↔ n1π + n2 K. These multi-mesonic reactions easily explain the antihyperon yields at CERN-SpS energies as advertised in pure thermal, hadronic models without the need of a quark gluon plasma phase. In addition, the argument also does nicely apply at AGS energies and (future) GSI energies.
Supported by BMBF and GSI Darmstadt