Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2007-01-23
Phys.Rev.Lett.98:252001,2007
Physics
High Energy Physics
High Energy Physics - Experiment
Accepted for publication in PRL. Minor changes in text, added two references, updated table 1
Scientific paper
10.1103/PhysRevLett.98.252001
We present particle spectra for charged hadrons $\pi^\pm, K^\pm, p$ and $\bar{p}$ from pp collisions at $\sqrt{s}=200$ 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 $\bar{p}/p$ ratios.
Arsene Ionut
BRAHMS Collaboration
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