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Verhandlungen
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Göttingen 2012 – scientific programme

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T: Fachverband Teilchenphysik

T 26: QCD 2

T 26.3: Talk

Tuesday, February 28, 2012, 17:25–17:40, ZHG 009

Inclusive-jet photoproduction at HERA — •Denys Lontkovskyi — Notkestrasse 85, DESY, Hamburg, Germany

The study of jet production at ep collider HERA has been well established as a way of testing perturbative QCD. Jet cross sections allow to test theory predictions, extract the fundamental parameter of the theory, αs, and give a valuable input for QCD fits in order to determine the parton distribution functions of the proton. Inclusive-jet cross sections were measured in epe + jet + X for photon virtuality Q2 < 1 GeV2 and γ p centre-of-mass energies in range 142 < Wγ p < 293 GeV with the ZEUS detector using an integrated luminosity of 300 pb−1. Single-differential cross sections are presented as functions of the jet transverse energy, ETjet, and pseudorapidity, ηjet, for jets with ETjet>17 GeV and −1<ηjet<2.5. In addition, measurements of double-differential inclusive-jet cross sections are presented as functions of ETjet in different regions of ηjet. Next-to-leading-order QCD predictions are compared to the measurements, and give a good description of the measured cross sections except at high ηjet. Precise values of αs(MZ) were extracted from the measurements and the energy-scale dependence of the coupling was determined.

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