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Identified baryon and meson distributions at large transverse momenta from Au + Au collisions at square root sNN=200 GeV |
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| Authors: | Abelev B I Aggarwal M M Ahammed Z Anderson B D Anderson M Arkhipkin D Averichev G S Bai Y Balewski J Barannikova O Barnby L S Baudot J Bekele S Belaga V V Bellingeri-Laurikainen A Bellwied R Benedosso F Bhardwaj S Bhasin A Bhati A K Bichsel H Bielcik J Bielcikova J Bland L C Blyth S-L Bonner B E Botje M Bouchet J Brandin A V Bravar A Burton T P Bystersky M Cadman R V Cai X Z Caines H Calderón de la Barca Sánchez M Castillo J Catu O Cebra D Chajecki Z Chaloupka P Chattopadhyay S Chen H F Chen J H Cheng J Cherney M Chikanian A Christie W Coffin J P Cormier T M Cosentino M R Cramer J G |
| Affiliation: | Yale University, New Haven, Connecticut 06520, USA. |
| Abstract: | Transverse momentum spectra of pi+/-, p, and p up to 12 GeV/c at midrapidity in centrality selected Au + Au collisions at square root sNN=200 GeV are presented. In central Au + Au collisions, both pi +/- and p(p) show significant suppression with respect to binary scaling at pT approximately >4 GeV/c. Protons and antiprotons are less suppressed than pi+/-, in the range 1.5 approximately < pT approximately < 6 GeV/c. The pi-/pi+ and p/p ratios show at most a weak pT dependence and no significant centrality dependence. The p/pi ratios in central Au + Au collisions approach the values in p + p and d + Au collisions at pT approximately >5 GeV/c. The results at high pT indicate that the partonic sources of pi+/-, p, and p have similar energy loss when traversing the nuclear medium. |
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