Can phi mesons give an answer to the baryon puzzle at RHIC?
(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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https://lup.lub.lu.se/record/910269
- author
- organization
- publishing date
- 2005
- type
- Contribution to journal
- publication status
- published
- subject
- 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
- additional info
- On behalf ot the PHENIX Collaboration
- id
- 9d81b135-4450-4e66-906f-758f877fd721 (old id 910269)
- date added to LUP
- 2016-04-01 16:11:02
- date last changed
- 2023-01-04 21:53:43
@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}}, doi = {{10.1140/epjc/s2005-02326-6}}, volume = {{43}}, year = {{2005}}, }