Higher-order pQCD corrections play an important role in the reproduction of data at high transverse momenta in the energy range 20 GeV \( \leq \sqrt{s} \leq 200\) GeV. Recent calculations of photon ...and pion production in \(pp\) collisions yield detailed information on the next-to-leading order contributions. However, the application of these results in proton-nucleus and nucleus-nucleus collisions is not straightforward. The study of nuclear effects requires a simplified understanding of the output of these computations. Here we summarize our analysis of recent calculations, aimed at handling the NLO results by introducing process and energy-dependent \(K\) factors.
Eur.Phys.J.C48:53-105,2006 A third workshop on small-x physics, within the Small-x Collaboration, was
held in Hamburg in May 2004 with the aim of overviewing recent theoretical
progress in this area ...and summarizing the experimental status.
In this talk we present a perturbative QCD improved parton model calculation for light meson production in high energy heavy ion collisions. In order to describe the experimental data properly, one ...needs to augment the standard pQCD model by the transverse momentum distribution of partons ("intrinsic k_T"). Proton-nucleus data indicate the presence of nuclear shadowing and multiscattering effects. Further corrections are needed in nucleus-nucleus collisions to explain the observed reduction of the cross section. We introduce the idea of proton dissociation and compare our calculations with the SPS and RHIC experimental data.
A third workshop on small-x physics, within the Small-x Collaboration, was held in Hamburg in May 2004 with the aim of overviewing recent theoretical progress in this area and summarizing the ...experimental status.
