26-30 March 2012
University of Bonn
Europe/Berlin timezone

Measurement of the t dependence in exclusive photoproduction of Upsilon (1S) mesons at HERA

28 Mar 2012, 16:00
Lecture Hall, Institute for Applied Physics (University of Bonn)

Lecture Hall, Institute for Applied Physics

University of Bonn

Diffraction and vector mesons Diffraction and vector mesons


Jacek Ciborowski (University of Warsaw)


The exclusive photoproduction reaction gamma p -> Upsilon(1S) p has been studied with the ZEUS detector in ep collisions at HERA using an integrated luminosity of 468pb-1. The measurement covers the kinematic range 60 < W < 220 GeV and Q2 < 1 GeV2, where W is the photon--proton centre-of-mass energy and Q2 is the photon virtuality. The exponential slope, b, of the t dependence of the cross section, where t is the squared four-momentum transfer at the proton vertex, has been measured, yielding b=4.3 +2.0-1.3 (stat.) +0.5-0.6 (syst.) GeV2. This constitutes the first measurement of the t dependence of the gamma p -> Upsilon(1S) p cross section.

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