Enhanced strange particle yields : signal of a phase of massless particles?

  • The yields of strange particles are calculated with the UrQMD model for p,Pb(158 AGeV)Pb collisions and compared to experimental data. The yields are enhanced in central collisions if compared to proton induced or peripheral Pb+Pb collisions. The enhancement is due to secondary interactions. Nevertheless, only a reduction of the quark masses or equivalently an increase of the string tension provides an adequate description of the large observed enhancement factors (WA97 and NA49). Furthermore, the yields of unstable strange resonances as the Lambda star(1520) resonance or the phi meson are considerably affected by hadronic rescattering of the decay products.

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Author:Sven SoffORCiD, Detlef ZschiescheGND, Marcus BleicherORCiDGND, Christoph HartnackORCiD, Mohamed Belkacem, Larissa BravinaORCiDGND, Eugene E. ZabrodinORCiD, Steffen A. BassORCiDGND, Horst StöckerORCiDGND, Walter GreinerGND
Document Type:Preprint
Year of Completion:2000
Year of first Publication:2000
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2005/04/14
Contribution to Strangeness 2000 Conf., published in Journal-ref: J.Phys. G27 (2001) 449-458
Source:http://de.arxiv.org/abs/nucl-th/0010103 , Contribution to Strangeness 2000 Conf., published in Journal-ref: J.Phys. G27 (2001) 449-458
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoDeutsches Urheberrecht