Bonn 2010 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 64: Hadronenstruktur und -spektroskopie X

HK 64.4: Vortrag

Freitag, 19. März 2010, 15:00–15:15, HG III

Partonic offshell effects in next-to-leading order Drell-Yan processes at PANDA energies — •Fabian Eichstädt1, Stefan Leupold1,2, and Ulrich Mosel11Institut für Theoretische Physik, Universität Giessen — 2Department of Physics and Astronomy, Uppsala University, Sweden

We investigate the effects of quark distributions of intrinsic transverse momentum and mass on the unpolarised production of Drell-Yan (DY) pairs. The standard leading-order parton model description has shortcomings: a K-factor is necessary to describe invariant mass spectra and no transverse momentum pT is generated in this scheme [1]. In addition, e.g., PANDA at FAIR will measure at comparatively low hadron centre-of-mass energies of √s ≈ 5.5   GeV [2]. Therefore non-pertubative effects are expected to play an important role. To address these issues we study a QCD-inspired phenomenological parton model which includes leading-order [3] and next-to-leading-order (NLO) production processes. We introduce mass distributions for the quarks to handle the divergencies of the NLO processes at pT → 0. Finally, fixing our phenomenological distributions at available data, our aim is to predict DY pair production at PANDA.

Supported by HIC for FAIR and GSI.

[1] S. Gavin et al., Int. J. Mod. Phys. A10, 2961 (1995).

[2] M. F. M. Lutz et al. (PANDA), arXiv: 0809.2262 [hep-ex].

[3] F. Eichstädt et al., Phys. Rev. D in press, arXiv:0909.4159 [hep-ph].

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