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David Silvermyr

David Silvermyr

Senior lecturer

David Silvermyr

Can phi mesons give an answer to the baryon puzzle at RHIC?

Author

  • Julia Velkovska
  • Sten Garpman
  • Hans-Åke Gustafsson
  • Pål Nilsson
  • Joakim Nystrand
  • Anders Oskarsson
  • Ingvar Otterlund
  • Sarah Rosendahl
  • David Silvermyr
  • Evert Stenlund
  • Henrik Tydesjö
Show all

Summary, in English

The PHENIX experiment at RHIC has observed a large enhancement of baryon and anti-baryon production at p(T) approximate to 2-5 GeV/c, compared to expectations from jet fragmentation. While a number of theoretical interpretations of the data are available, there is not yet a definitive answer to the "baryon puzzle". We investigate the centrality dependence of phi-meson production at mid-rapidity in Au+Au collisions with root s(NN) = 200 GeV. Comparison with the proton and anti-proton spectra reveal similar shapes, as expected for soft production described by hydrodynamics. However, the absolute yields show a different centrality dependence. The nuclear modi. cation factors for phi are similar to those of pions, rather than (anti) protons that have similar mass. At intermediate p(T), baryon/meson effects seem to be more important than the mass effects, in support of recombination models.

Department/s

  • Particle and nuclear physics

Publishing year

2005

Language

English

Pages

317-322

Publication/Series

European Physical Journal C. Particles and Fields

Volume

43

Issue

1-4

Document type

Journal article

Publisher

Springer

Topic

  • Subatomic Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1434-6044