HAL : in2p3-00166435, version 1

arXiv : hep-ex/0701041

DOI : 10.1103/PhysRevLett.98.252001

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Physical Review Letters 98 (2007) 252001

Production of Mesons and Baryons at High Rapidity and High pT in Proton-Proton Collisions at $\sqrt(s)$=200 GeV

I. Arsene, I.G. Bearden, D. Beavis, S. Bekele, C. Besliu, B. Budick, H. Boggild, C. Chasman, C.H. Christensen, H.H. Dalsgaard, R. Debbe, J.J. Gaardhoje, K. Hagel, H. Ito, A. Jipa, E.B. Johnson, C.E. Jorgensen, R. Karabowicz, N. Katrynska, E.J. Kim, T.M. Larsen, J.H. Lee, S. Lindal, G. Lovhoiden, Z. Majka, M. Murray, J. Natowitz, B.S. Nielsen, C. Nygaard, R. Planeta, F. Rami1, F. Renault, C. Ristea, O. Ristea, D. Rohrich, 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

BRAHMS Collaboration(s)

(2007)

We present particle spectra for charged hadrons pi(+/-), K-+/-, p, and (p) over bar from pp collisions at 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 bar /p ratios

1 :	DRS-IPHC - Département Recherches Subatomiques

Thème(s)

:

Physique/Physique des Hautes Energies - Expérience

Mot(s)-clé(s) : FRAGMENTATION FUNCTIONS – CROSS-SECTIONS – QUARK

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Contributeur : Yvette Heyd <>

Soumis le : Lundi 6 Août 2007, 15:10:56

Dernière modification le : Lundi 6 Août 2007, 15:53:16