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

Velkovska, Julia LU ; Garpman, Sten LU ; Gustafsson, Hans-Åke LU ; Nilsson, Pål LU ; Nystrand, Joakim LU ; Oskarsson, Anders LU ; Otterlund, Ingvar LU ; Rosendahl, Sarah LU ; Silvermyr, David LU and Stenlund, Evert LU , et al. (2005) In European Physical Journal C. Particles and Fields 43(1-4). p.317-322
Abstract
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... (More)
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. (Less)
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Contribution to journal
publication status
published
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in
European Physical Journal C. Particles and Fields
volume
43
issue
1-4
pages
317 - 322
publisher
Springer
external identifiers
  • wos:000231220200050
  • scopus:23944457360
ISSN
1434-6044
DOI
10.1140/epjc/s2005-02326-6
language
English
LU publication?
yes
id
9d81b135-4450-4e66-906f-758f877fd721 (old id 910269)
date added to LUP
2008-01-23 11:05:51
date last changed
2017-01-01 06:58:07
@article{9d81b135-4450-4e66-906f-758f877fd721,
  abstract     = {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.},
  author       = {Velkovska, Julia and Garpman, Sten and Gustafsson, Hans-Åke and Nilsson, Pål and Nystrand, Joakim and Oskarsson, Anders and Otterlund, Ingvar and Rosendahl, Sarah and Silvermyr, David and Stenlund, Evert and Tydesjö, Henrik},
  issn         = {1434-6044},
  language     = {eng},
  number       = {1-4},
  pages        = {317--322},
  publisher    = {Springer},
  series       = {European Physical Journal C. Particles and Fields},
  title        = {Can phi mesons give an answer to the baryon puzzle at RHIC?},
  url          = {http://dx.doi.org/10.1140/epjc/s2005-02326-6},
  volume       = {43},
  year         = {2005},
}