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

We present a measurement of π−/π+, K−/K+ and p¯/p from p+p collisions at s=200GeV over the rapidity range 02.0. The p¯/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 p¯/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.