Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 23: Hadronenstruktur und -spektroskopie
HK 23.2: Vortrag
Mittwoch, 21. März 2012, 14:30–14:45, RW 2
Cross section for quasi-real photo-production of charged hadrons with high transverse momenta in muon-deuteron scattering — •Christian Höppner — Physik-Department E18, Technische Universität München
The measurement of unpolarized high-pT hadron-production cross sections provides an important benchmark for the applicability of perturbative QCD (pQCD) calculations, especially at lower center-of-mass energies, where corrections beyond the next-to-leading order could become important. These calculations rely on the factorization of unpolarized and polarized cross sections into non-perturbative parton distribution functions, which parametrize the structure of the nucleon, hard scattering cross sections, calculable in pQCD, and non-perturbative fragmentation functions. In this contribution we shall present the first measurement of the unpolarized cross section for the quasi-real photo-production of charged hadrons with high transverse momenta from muon-deuteron scattering data at √s=17.4 GeV at COMPASS. The dependence of the cross section on pT for forward and central rapidities is discussed. The presented cross section results are compared to recent NLO pQCD calculations.