Forward and midrapidity like-particle ratios from p+p collisions at sqrt(s)=200 GeV

Details Forward and midrapidity like-particle ratios from p+p collisions at sqrt(s)=200 GeV Forward and midrapidity like-particle ratios from p+p collisions at sqrt(s)=200 GeV

2004-09-02

arxiv.org/abs/nucl-ex/0409002v2

Phys.Lett. B607 (2005) 42-50

Physics

Nuclear Physics

Nuclear Experiment

15 pages, 4 figures, uses elsart.sty. Changes to references and discussion based on referee comments, resubmitted to Phys. Let

Scientific paper

10.1016/j.physletb.2004.12.064

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.

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