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          Institute: MPI für Physik     Collection: MPI für Physik     Display Documents



ID: 543857.0, MPI für Physik / MPI für Physik
Energy dependence of charged pion, proton and anti-proton transverse momentum spectra for Au+Au collisions at \sqrt{s_NN} = 62.4 and 200 GeV
Authors:STAR Collaboration; Abelev, B.; Eckardt, V.; Schmitz, N.; Seyboth, P.; et al.
Date of Publication (YYYY-MM-DD):2007
Title of Journal:Physics Letters B
Journal Abbrev.:Phys.Lett.B
Issue / Number:655
Start Page:104
End Page:113
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:We study the energy dependence of the transverse momentum (pT) spectra for charged pions, protons and anti-protons for Au+Au collisions at \sqrt{s_NN} = 62.4 and 200 GeV. Data are presented at mid-rapidity (|y| < 0.5) for 0.2 < pT < 12 GeV/c. In the intermediate pT region (2 < pT < 6 GeV/c), the nuclear modification factor is higher at 62.4 GeV than at 200 GeV, while at higher pT (pT >7 GeV/c) the modification is similar for both energies. The p/pi+ and pbar/pi- ratios for central collisions at \sqrt{s_NN} = 62.4 GeV peak at pT ~ 2 GeV/c. In the pT range where recombination is expected to dominate, the p/pi+ ratios at 62.4 GeV are larger than at 200 GeV, while the pbar/pi- ratios are smaller. For pT > 2 GeV/c, the pbar/pi- ratios at the two beam energies are independent of pT and centrality indicating that the dependence of the pbar/pi- ratio on pT does not change between 62.4 and 200 GeV. These findings challenge various models incorporating jet quenching and/or constituent quark coalescence.
Classification / Thesaurus:STAR
Comment of the Author/Creator:19 pages and 6 figures
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Physik
Identifiers:LOCALID:MPP-2007-243
URL:http://www.slac.stanford.edu/spires/find/hep/www?r...
URL:http://arXiv.org/abs/nucl-ex/0703040
URL:http://publications.mppmu.mpg.de/?action=search&mp...
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