Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 25: Physik mit schweren Ionen
HK 25.5: Vortrag
Dienstag, 8. März 2005, 15:15–15:30, TU MA144
High pt spectra of KS0 and Λ produced in Pb+Pb collisions at 158 A· GeV* — •Tim Schuster1, C. Alt1, C. Blume1, P. Dinkelaker1, D. Flierl1, V. Friese2,3, M. Gazdzicki1, M. Kliemant1, S. Kniege1, F. Kramer1, I. Kraus2, B. Lungwitz1, C. Meurer1, M. Mitrovski1, R. Renfordt1, A. Richard1, A. Sandoval2, R. Stock1, C. Strabel1, and H. Ströbele1 — 1Institut für Kernphysik, Universität Frankfurt — 2Gesellschaft für Schwerionenforschung (GSI), Darmstadt — 3Fachbereich Physik der Universität, Marburg
Studying the production of hadrons with transverse momenta in the range of 2 < pt < 4 GeV/c in ultrarelativistic heavy ion collisions can answer questions about the hadron production mechanisms involved. The comparison of baryon and meson spectra is of particular interest in this context to tell when fragmentation and when recombination is the predominant origin of produced hadrons. Recent results from RHIC concerning elliptic flow and baryon / meson ratios might lead to the assumption that recombination is favoured in the region 2 < pt < 4 GeV/c.
In the NA49 large acceptance hadron spectrometer, KS0 and Λ are identified via their V0 decay-topology. This allows for unambiguous particle identification up to the required range of pt.
Preliminary pt-spectra for KS0 and Λ produced in central Pb+Pb reactions at 158 A· GeV will be presented, reaching pt = 3.8 GeV/c (KS0) and pt = 4.4 GeV/c (Λ) respectively.
* Supported by BMBF and GSI