Saturating Cronin effect in ultrarelativistic proton-nucleus collisions

Abstract

Pion and photon production cross sections are analyzed in proton-proton and proton-nucleus collisions at energies 20 GeV < s^1/2 < 60 GeV. We separate the proton-proton and nuclear contributions to transverse-momentum broadening and suggest a new mechanism for the nuclear enhancement in the high transverse-momentum region.

Comments: 4 pages, Latex and 4 EPS figures are included