Single-transverse-spin asymmetries of identified charged hadrons in polarized pp collisions at sqrt[s]=62.4 GeV

Single-transverse-spin asymmetries of identified charged hadrons in polarized pp collisions at sqrt[s]=62.4 GeV

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+ p...

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Veröffentlicht in:Physical review letters 2008-07, Vol.101 (4), p.042001-042001
Hauptverfasser: 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
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Sprache:eng
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Zusammenfassung: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.
ISSN:0031-9007