Bochum 2009 – wissenschaftliches Programm

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HK: Fachverband Hadronen und Kerne

HK 56: Hadron Structure and Spectroscopy I

HK 56.4: Vortrag

Mittwoch, 18. März 2009, 17:30–17:45, H-ZO 20

Hadron production in muon-nucleon deep inelastic scattering at COMPASS — •Jean-Francois Rajotte — Fakultät Physik LMU München, Am Coulombwall 1 Garching 85748, Deutschland

The COMPASS experiment at CERN is running since 2002. Its main goals are to improve our knowledge of the nucleon spin structure, using a polarized muon beam and a polarized target, and to contribute to hadron spectroscopy, using hadron beams and searching for "exotic" hadrons with constituent gluons. To reach these goals, the collaboration has built an open spectrometer to detect, with high precision, the incoming muon of 160GeV/c, the outgoing muon and the produced hadrons. The large amount of high quality data accumulated gives access to the (un)polarized parton distributions of the nucleon, and the hadronisation process.

Results will be presented on the absolute (unpolarized) inclusive cross section for the deep-inelastic muon-nucleon interaction, on the single-photon exchange cross section extracted from it, and on the nucleon structure function F2. The latter will be compared with the results from the earlier NMC experiment.

The subtle difference (asymmetry) between semi-inclusive differential cross sections has been predicted for the production of hadrons in polarized muon-nucleon interactions as a function of transverse momentum of hadrons. In this context, it is important to first compare predictions with the gross features of the unpolarized cross section. The unpolarized semi-inclusive cross sections will be shown. They can be used as benchmark for the reliability of theoretical calculations.