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Phys Rev Lett. 2007 Jun 22;98(25):252001. doi: 10.1103/PhysRevLett.98.252001. Epub 2007 Jun 21.

Production of mesons and baryons at high rapidity and high p(T) in proton-proton collisions at square root[s] = 200 GeV.

Physical review letters

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 Kim, T 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 Videbaek, R Wada, Z Yin, H Yang, I S Zgura

Affiliations

  1. Department of Physics, University of Oslo, Oslo, Norway.

PMID: 17678015 DOI: 10.1103/PhysRevLett.98.252001

Abstract

We present particle spectra for charged hadrons pi(+/-), K(+/-), p, and p[over] from pp collisions at square root[s] = 200 GeV 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 4 GeV/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 p[over]/p ratios.

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