Single-transverse-spin asymmetries of identified charged hadrons in polarized pp collisions at sqrt[s]=62.4 GeV |
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| Authors: | Arsene I,Bearden I G,Beavis D,Bekele S,Besliu C,Budick B,Bøggild H,Chasman C,Dalsgaard H H,Debbe R,Fox B,Gaardhøje J J,Hagel K,Jipa A,Johnson E B,Karabowicz R,Katryńska N,Kim E J,Larsen T M,Lee J H,Løvhøiden G,Majka Z,Murray M,Nygaard C,Natowitz J,Nielsen B S,Pal D,Qviler A,Ristea C,Röhrich D,Sanders S J,Staszel P,Tveter T S,Videbaek F,Yang H,Wada R BRAHMS Collaboration |
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| Affiliation: | Department of Physics, University of Oslo, Oslo, Norway. |
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| Abstract: | The first measurements of xF-dependent single-spin asymmetries of identified charged hadrons, pi+/-, K+/-, and protons, from transversely polarized proton-proton collisions at 62.4 GeV at RHIC are presented. Large asymmetries are seen in the pion and kaon channels. The asymmetries in inclusive pi+ production, AN(pi+), increase with xF from 0 to approximately 0.25 and AN(pi-) decrease from 0 to approximately -0.4. Observed asymmetries for K- unexpectedly show positive values similar to those for K+, increasing with xF, whereas proton asymmetries are consistent with zero over the measured kinematic range. Comparisons of the data with predictions of QCD-based models are presented. |
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