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T: Fachverband Teilchenphysik

T 39: Bottom-Quark Produktion 2

T 39.3: Talk

Wednesday, March 11, 2009, 17:15–17:30, A119

Upsilon meson production at HERA — •Igor Rubinsky — DESY, Notkestrasse 85, Hamburg — Hamburg University

Using the full HERA data set of 468 pb⁻¹ taken between 1996 and 2007 with the ZEUS detector, the cross section of exclusive Upsilon production in the di-muon decay channel has been measured as a function of W and Q². The QED di-lepton background was simulated using the Monte Carlo program GRAPE, and DIFFVM for the Upsilon signal events. The results are consistent with the prediction of the QCD model: two-gluon exchange as calculated by MNRT (Martin-Nockles-Ryskin-Teubner) and non-relativistic QCD NLO calculations.

The feasibility of a measurement of the |t| dependence of the cross section is discussed, where |t| is the absolute value of the 4-momentum transfer to the proton, as well as an extension of the measurement to inelastic Upsilon production as function of the event inelasticity z.