Enhanced Strange Particle Yields - Signal of a Phase of Massless Particles ?

Details Enhanced Strange Particle Yields - Signal of a Phase of Massless Particles ? Enhanced Strange Particle Yields - Signal of a Phase of Massless Particles ?

2000-10-31

arxiv.org/abs/nucl-th/0010103v1

J.Phys.G27:449-458,2001

Physics

Nuclear Physics

Nuclear Theory

Contribution to Strangeness 2000 Conf., published in J.Phys.G.:Nucl.Phys.; 7 pages

Scientific paper

10.1088/0954-3899/27/3/324

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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