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Effects of Parton kt in High-pt Particle Production

M. Zielinski
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Abstract

We report on recent work concerning the phenomenology of initial-state parton-kt effects in direct-photon production and related processes in hadron collisions. After a brief summary of a kt-smearing model, we present a study of recent results on fixed-target and collider direct-photon production, using complementary data on diphoton and pion production that provide empirical guidance on the required amount of kt broadening. This approach provides a consistent description of the observed deviations of next-to-leading order QCD calculations relative to the inclusive direct-photon and pizero data. We also comment on the implications of these results for the extraction of the gluon distribution of the nucleon.

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M. Zielinski. 1998-11-09. Effects of Parton kt in High-pt Particle Production. https://arxiv.org/abs/hep-ph/9811278

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