Intrinsic parton transverse momentum in next-to-leading-order pion production

2002/12/17 by G. Papp, Gábor Papp, Papp, G. +9
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph #nucl-th

paper · pdf · doi:10.48550/arxiv.hep-ph/0212249

5 pages with 4 PS figures included

openalex publication_date 2002/12/17 · arxiv created 2003/07/15 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

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 p_T 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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