Energy dependence of π^±, p and transverse momentum spectra for Au+Au collisions at and 200 GeV

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• 作者：B.I. Abelev ; M.M. Aggarwal ; Z. Ahammed ; B.D. Anderson ; D. Arkhipkin ; G.S. Averichev ; Y. Bai ; J. Balewski ; O. Barannikova ; L.S. Barnby ; S. Baumgart ; V.V. Belaga ; A. Bellingeri-Laurikainen ; R. Bellwied
• 关键词：Particle production ; Recombination ; Fragmentation ; Jet quenching ; Nuclear modification factor ; Particle ratios
• 刊名：Physics Letters B
• 出版年：2007
• 出版时间：1 November 2007
• 年：2007
• 卷：655
• 期：3-4
• 页码：104-113
• 全文大小：1345 K

文摘

We study the energy dependence of the transverse momentum (p_T) spectra for charged pions, protons and anti-protons for Au+Au collisions at and 200 GeV. Data are presented at mid-rapidity (|y|<0.5) for . In the intermediate p_T region (), the nuclear modification factor is higher at 62.4 GeV than at 200 GeV, while at higher p_T () the modification is similar for both energies. The p/π⁺ and ratios for central collisions at peak at . In the p_T range where recombination is expected to dominate, the p/π⁺ ratios at 62.4 GeV are larger than at 200 GeV, while the ratios are smaller. For , the ratios at the two beam energies are independent of p_T and centrality indicating that the dependence of the ratio on p_T does not change between 62.4 and 200 GeV. These findings challenge various models incorporating jet quenching and/or constituent quark coalescence.