Cronin effect for protons and pions in pA collisions

Details Cronin effect for protons and pions in pA collisions Cronin effect for protons and pions in pA collisions

2008-10-27

arxiv.org/abs/0810.4942v3

Nucl.Phys.A826:198-210,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 8 figures

Scientific paper

10.1016/j.nuclphysa.2009.05.073

Pions and protons production cross-sections are analyzed in proton-proton and proton-nucleus collisions at the RHIC energy at midrapidity. We employ the pQCD factorization scheme supplemented with the color-dipole formalism to investigate the Cronin effect. We calculate the broadening in the color-dipole approach for different centralities. Our main goal is to investigate, in a parameter-free manner within a unified framework, how much of the cronin effect for both pions and baryons comes from the transverse momentum broadening due to initial partons multi-scatterings. We conclude that final-state effects in pA collisions are important. Uncertainties in nuclear shadowing of various parton distributions and parton fragmentation functions are also discussed.

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