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HK: Fachverband Physik der Hadronen und Kerne

HK 42: Hadronenstruktur und -spektroskopie VII

HK 42.6: Vortrag

Mittwoch, 23. März 2011, 18:00–18:15, C-2

Description of fully differential Drell-Yan pair production — •Fabian Eichstaedt¹, Stefan Leupold², Hendrik van Hees¹, and Ulrich Mosel¹ — ¹Institut für Theoretische Physik, Universität Giessen, Germany — 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 p_T 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 production processes. We show that we can describe DY transverse momentum and invariant mass spectra without the need for a K factor. Finally fixing our phenomenological distributions at available data one aim is to make predictions for DY pair production at PANDA.

Supported by HGS-HIRe.

[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. D81, 034002 (2010).