Journal article
Scaling violations and determination of alpha(s) from jet production in gamma p interactions at HERA
Physics letters. B, Vol.560(1-2), pp.7-23
05/08/2003
DOI: 10.1016/S0370-2693(03)00380-0
Abstract
Differential cross sections for jet photoproduction in the reaction ep --> e jet X have been measured with the ZEUS detector at HERA using 82.2 pb(-1) of integrated luminosity. Inclusive jet cross sections are presented as a function of the jet transverse energy, E-T(jet), for jets with E-T(jet) > 17 GeV and pseudorapidity -1 < eta(jet) < 2.5, in the gammap centre-of-mass-energy range 142 < Wgammap < 293 GeV. Scaled jet invariant cross sections are presented as a function of the dimensionless variable x(T) equivalent to 2E(T)(jet)/W-gammap for (W-gammap) = 180 and 255 GeV: Next-to-leading-order QCD calculations give a good description of the measured differential cross sections in both magnitude and shape. The ratio of scaled jet invariant cross sections at the two (Wgammap) values shows clear non-scaling behaviour. A value for the strong coupling constant of alpha(s) (M-Z) = 0.1224 +/- 0.0001(stat.)(-0.0019)(+0.0022)(exp.)(-0.0042)(+0.0054)(th.) has been extracted from a QCD analysis of the measured dsigma/dE(T)(jet). The variation of sigma(s) with E-T(jet) is in good agreement with the running of sigma(s) as predicted by QCD. (C) 2003 Published by Elsevier Science B.V.
Details
- Title: Subtitle
- Scaling violations and determination of alpha(s) from jet production in gamma p interactions at HERA
- Creators
- ZEUS CollaborationJ Repond (Contributor)
- Resource Type
- Journal article
- Publication Details
- Physics letters. B, Vol.560(1-2), pp.7-23
- DOI
- 10.1016/S0370-2693(03)00380-0
- ISSN
- 0370-2693
- eISSN
- 1873-2445
- Publisher
- Elsevier
- Number of pages
- 17
- Language
- English
- Date published
- 05/08/2003
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627240902771
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