Results from pp at 62.4 GeV and 200 GeV with the BRAHMS experiment
F.Videbaek (for the BRAHMS collaboration)
TL;DR
This paper presents measurements of proton-proton collisions at 62.4 and 200 GeV, showing that NLO pQCD accurately describes pion production and revealing large spin asymmetries at 62.4 GeV.
Contribution
It provides new experimental data on pp collisions at two energies and tests pQCD models against observed pion production and spin asymmetries.
Findings
NLO pQCD describes pion production well at both energies.
Large transverse single spin asymmetries observed at 62.4 GeV.
Models based on pQCD reasonably explain the asymmetries at high transverse momentum.
Abstract
Measurements of elementary pp collisions are an integral component to understand heavy ion collisions. Results for pp collisions at 200 and 62.4 GeV are presented. At both energies NLO pQCD describes pion production well. The measured pion transverse single spin asymmetries are very large at 62.4 GeV and are reasonably well described by models relying on pQCD at transverse momenta larger than 1 GeV/c.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Particle Detector Development and Performance · High-Energy Particle Collisions Research