Production of mesons and baryons at high rapidity and high pT in proton-proton collisions at s=200GeV

I. Arsene, I. G. Bearden, D. Beavis, S. Bekele, C. Besliu, B. Budick, H. Bøggild, C. Chasman, C. H. Christensen, H. H. Dalsgaard, R. Debbe, J. J. Gaardhøje, K. Hagel, H. Ito, A. Jipa, E. B. Johnson, C. E. Jørgensen, R. Karabowicz, N. Katrynska, E. J. KimT. M. Larsen, J. H. Lee, S. Lindal, G. Løvhøiden, Z. Majka, M. Murray, J. Natowitz, B. S. Nielsen, C. Nygaard, R. Płaneta, F. Rami, F. Renault, C. Ristea, O. Ristea, D. Röhrich, B. H. Samset, S. J. Sanders, R. A. Scheetz, P. Staszel, T. S. Tveter, F. Videbæk, R. Wada, Z. Yin, H. Yang, I. S. Zgura

    Research output: Contribution to journalArticlepeer-review


    We present particle spectra for charged hadrons π±, K±, p, and p̄ from pp collisions at s=200GeV measured for the first time at forward rapidities (2.95 and 3.3). The kinematics of these measurements are skewed in a way that probes the small momentum fraction in one of the protons and large fractions in the other. Large proton to pion ratios are observed at values of transverse momentum that extend up to 4GeV/c, where protons have momenta up to 35 GeV. Next-to-leading order perturbative QCD calculations describe the production of pions and kaons well at these rapidities, but fail to account for the large proton yields and small p̄/p ratios.

    Original languageEnglish (US)
    Article number252001
    JournalPhysical Review Letters
    Issue number25
    StatePublished - Jun 21 2007

    ASJC Scopus subject areas

    • General Physics and Astronomy


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