Intrinsic parton transverse momentum in next-to-leading-order pion production
Abstract
We study pion production in proton-proton collisions within a pQCD-improved parton model in next-to-leading order augmented by intrinsic transverse momentum (k) of the partons. We find the introduction of k necessary to reproduce the experimental data in the CERN SPS to RHIC energy range. We study the influence of intrinsic k on the so-called K factor, the ratio of the NLO cross section to the Born term. A strong pT dependence is seen, especially in the 3-6 GeV transverse momentum region of the outgoing pion, where nuclear effects (e.g. the Cronin effect) play an important role.
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