HAL : in2p3-00023339, version 1

arXiv : nucl-ex/0409002

DOI : 10.1016/j.physletb.2004.12.064

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Physics Letters B 607 (2005) 42-50

Forward and midrapidity like-particle ratios from p+p collisions at $\sqrt{s}$ = 200 GeV

I.G. Bearden, D. Beavis, C. Besliu, B. Budick, H. Boggild, C. Chasman, C.H. Christensen, P. Chrisitansen, J. Cibor, R. Debbe, E. Enger, J.J. Gaardhoje, M. Germinario, K. Hagel, A. Holm, A.K. Holme, H. Ito, E. Jacobsen, A. Jipa, F. Jundt1, J.I. Jordre, C.E. Jorgensen, R. Karabowicz, T. Keutgen, E.J. Kim, T. Kozik, T.M. Larsen, J.H. Lee, Y.K. Lee, G. Lovhoiden, Z. Majka, A. Makeev, M. Mikelsen, M.J. Murray, J. Natowitz, B.S. Nielsen, J. Norris, K. Olchanski, D. Ouerdane, R. Planeta, F. Rami1, C. Ristea, D. Röhrich, B.H. Samset, D. Sandberg, S.J. Sanders, R.A. Scheetz, P. Staszel, T.S. Tveter, F. Videbaek, R. Wada, A. Wieloch, Z. Yin, I.S. Zgura, Brahms Collaboration

BRAHMS Collaboration(s)

(2005)

We present a measurement of pi-\pi+, K-/K+ and pbar/p from p+p collisions at sqrt(s) = 20 0GeV over the rapidity range 0 2.0. The pbar/p ratio is very similar for p+p and 20% central Au+Au collisions at all rapidities. In the fragmentation region the three ratios seem to be independent of beam energy when viewed from the rest frame of one of the protons. Theoretical models based on quark-diquark breaking mechanisms overestimate the pbar/p ratio up to y ~< 3. Including additional mechanisms for baryon number transport such as baryon junctions leads to a better description of the data.

1 :	IReS - Institut de Recherches Subatomiques

Thème(s)

:

Physique/Physique Nucléaire Expérimentale

Mot(s)-clé(s) : proton collisions – particle ratios – forward rapidity – limiting fragmentation – baryon junctions

in2p3-00023339, version 1

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Contributeur : Yvette Heyd <>

Soumis le : Mercredi 24 Novembre 2004, 15:28:26

Dernière modification le : Lundi 24 Janvier 2005, 15:47:03