Direct Photon Production in $pp$ and $p \bar p$ Collisions at High Energies

Details Direct Photon Production in $pp$ and $p \bar p$ Collisions at High Energies Direct Photon Production in $pp$ and $p \bar p$ Collisions at High Energies

2006-08-17

arxiv.org/abs/hep-ph/0608190v1

Int.J.Mod.Phys. A22 (2007) 541-545

Physics

High Energy Physics

High Energy Physics - Phenomenology

presented at the international conference MESON2006, Cracow 5 pages, 3 figures

Scientific paper

The invariant cross sections for direct photon production in hadron-hadron collisions are calculated for several initial energies (SPS, ISR, S$p \bar p$S, RHIC, Tevatron, LHC) including initial parton transverse momenta within the formalism of unintegrated parton distributions (UPDF). Kwieci\'nski UPDFs provide very good description of all world data, especially at SPS and ISR energies. Inclusion of the QCD evolution effects and especially their effect on initial parton transverse momenta allowed to solve the long-standing problem of understanding the low energy and low transverse momentum data.

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