Jet-radius dependence of inclusive-jet cross sections in deep inelastic scattering at HERA

Details Jet-radius dependence of inclusive-jet cross sections in deep inelastic scattering at HERA Jet-radius dependence of inclusive-jet cross sections in deep inelastic scattering at HERA

2007-01-20

arxiv.org/abs/hep-ex/0701039v2

Phys.Lett.B649:12-24,2007

Physics

High Energy Physics

High Energy Physics - Experiment

28 pages, 4 figures, 4 tables, minor revisions, accepted by Physics. Letters B, tables only in the hep-ex version

Scientific paper

10.1016/j.physletb.2007.03.039

Differential inclusive-jet cross sections have been measured for different jet radii in neutral current deep inelastic ep scattering for boson virtualities Q^2 > 125 GeV^2 with the ZEUS detector at HERA using an integrated luminosity of 81.7 pb^-1. Jets were identified in the Breit frame using the k_T cluster algorithm in the longitudinally inclusive mode for different values of the jet radius R. Differential cross sections are presented as functions of Q^2 and the jet transverse energy, E_T,B^jet. The dependence on R of the inclusive-jet cross section has been measured for Q^2 > 125 and 500 GeV^2 and found to be linear with R in the range studied. Next-to-leading-order QCD calculations give a good description of the measurements for 0.5 <= R <= 1. A value of alpha_s(M_Z) has been extracted from the measurements of the inclusive-jet cross-section dsigma/dQ^2 with R=1 for Q^2 > 500 GeV^2: alpha_s(M_Z) = 0.1207 +- 0.0014 (stat.) -0.0033 +0.0035 (exp.) -0.0023 +0.0022 (th.). The variation of alpha_s with E_T,B^jet is in good agreement with the running of alpha_s as predicted by QCD.

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