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HK: Fachverband Physik der Hadronen und Kerne
HK 45: Elektromagnetische und Hadronische Sonden II
HK 45.2: Group Report
Friday, March 14, 2008, 14:30–15:00, 2B
Production of heavy quarks in hadron–hadron collisions — •Johann Riedl1, Marco Stratmann2, and Andreas Schäfer1 — 1Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg — 2Radiation Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
The production of heavy quarks in polarised (anti-)proton-proton collisions is one of the processes which can provide information about the currently largely unconstrained gluon polarisation Δ g and about the sea quark densities Δq in the nucleon. For this purpose the calculation of the relevant cross sections in next-to-leading order of perturbative QCD is presented. The difference of the differential cross sections for the production of heavy quarks and antiquarks, the so-called charge asymmetry, is directly sensitive to next-to-leading order (NLO) corrections. Phenomenological studies for GSI FAIR, J-PARC and BNL-RHIC are given and the theoretical uncertainties of the NLO results are discussed.
Besides with the analytical inclusive framework, the phase space integration can also be done completely numerically using Monte Carlo integration methods; this allows more flexibility in choosing experimentally relevant variables and a simpler modelling of experimental cuts. For this purpose the technical framework is presented and applied to polarised heavy quark hadroproduction.
J. R. is supported by a grant of the Cusanuswerk, Bonn, Germany. This work was partly supported by BMBF.