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

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

2002-12-17

arxiv.org/abs/hep-ph/0212249v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages with 4 PS figures included

Scientific paper

We study pion production in proton-proton collisions within a pQCD-improved parton model in next-to-leading order augmented by intrinsic transverse momentum ($k_\perp$) of the partons. We find the introduction of $k_\perp$ necessary to reproduce the experimental data in the CERN SPS to RHIC energy range. We study the influence of intrinsic $k_\perp$ 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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