Single-transverse-spin asymmetries aof identified charged hadrons in polarized pp collisions at s=62.4GeV

I. Arsene, I. G. Bearden, D. Beavis, S. Bekele, C. Besliu, B. Budick, H. Bøggild, C. Chasman, H. H. Dalsgaard, R. Debbe, B. Fox, J. J. Gaardhøje, K. Hagel, A. Jipa, E. B. Johnson, R. Karabowicz, N. Katryńska, E. J. Kim, T. M. Larsen, J. H. LeeG. Løvhøiden, Z. Majka, M. Murray, C. Nygaard, J. Natowitz, B. S. Nielsen, D. Pal, A. Qviler, C. Ristea, D. Röhrich, S. J. Sanders, P. Staszel, T. S. Tveter, F. Videbæk, H. Yang, R. Wada

    Research output: Contribution to journalArticlepeer-review


    The first measurements of xF-dependent single-spin asymmetries of identified charged hadrons, π±, K±, and protons, from transversely polarized proton-proton collisions at 62.4GeV at RHIC are presented. Large asymmetries are seen in the pion and kaon channels. The asymmetries in inclusive π+ production, AN(π+), increase with xF from 0 to ∼0.25 and AN(π-) decrease from 0 to ∼-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.

    Original languageEnglish (US)
    Article number042001
    JournalPhysical Review Letters
    Issue number4
    StatePublished - Jul 22 2008

    ASJC Scopus subject areas

    • General Physics and Astronomy


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