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

BRAHMS Collaboration·I. G. Bearden
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Abstract

We present a measurement of pi-π+, 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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BRAHMS Collaboration, I. G. Bearden. 2004-12-03. Forward and midrapidity like-particle ratios from p+p collisions at sqrt(s)=200 GeV. https://doi.org/10.1016/j.physletb.2004.12.064

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