Name: ZEUS_2012_I1116258
Year: 2012
Summary: Inclusive-jet photoproduction at HERA and determination of the strong coupling
Experiment: ZEUS
Collider: HERA Run II
InspireID: 1116258
Status: UNVALIDATED
Reentrant: true
Authors:
 - Jon Butterworth <j.butterworth@ucl.ac.uk>
References:
 - Nucl.Phys. B864 (2012) 1-37
 - DESY 12/045
 - hep-ex/1205.6153
RunInfo:
  920 GeV protons colliding with 27.5 GeV positrons;
  Direct and resolved photoproduction of dijets;
  Jet $pT > 17$ GeV
  Jet pseudorapidity $-1 < |\eta| < 2.5$
NumEvents: 1000000
Beams: [p+, e+]
Energies: [[920, 27.5]]
Description:
   Inclusive-jet cross sections have been measured in the reaction ep->e+jet+X for photon virtuality Q2 < 1 GeV2 and gamma-p
   centre-of-mass energies in the region 142 < W(gamma-p) < 293 GeV with the ZEUS detector at HERA using an integrated
   luminosity of 300 pb-1. Jets were identified using the kT, anti-kT or SIScone jet algorithms in the laboratory frame.
   Single-differential cross sections are presented as functions of the jet transverse energy, ETjet, and pseudorapidity,
   etajet, for jets with ETjet > 17 GeV and -1 < etajet < 2.5. In addition, measurements of double-differential inclusive-jet
   cross sections are presented as functions of ETjet in different regions of etajet. Next-to-leading-order QCD calculations
   give a good description of the measurements, except for jets with low ETjet and high etajet. The influence of
   non-perturbative effects not related to hadronisation was studied. Measurements of the ratios of cross sections using
   different jet algorithms are also presented; the measured ratios are well described by calculations including up to
   O(alphas2) terms. Values of alphas(Mz) were extracted from the measurements and the energy-scale dependence of the
   coupling was determined. The value of alphas(Mz) extracted from the measurements based on the kT jet algorithm is
   alphas(Mz) = 0.1206 +0.0023 -0.0022 (exp.) +0.0042 -0.0035 (th.); the results from the anti-kT and SIScone algorithms
   are compatible with this value and have a similar precision.
BibKey: Abramowicz:2012jz
BibTeX: '@article{Abramowicz:2012jz,
      author         = "Abramowicz, H. and others",
      title          = "{Inclusive-jet photoproduction at HERA and determination
                        of alphas}",
      collaboration  = "ZEUS",
      journal        = "Nucl. Phys.",
      volume         = "B864",
      year           = "2012",
      pages          = "1-37",
      doi            = "10.1016/j.nuclphysb.2012.06.006",
      eprint         = "1205.6153",
      archivePrefix  = "arXiv",
      primaryClass   = "hep-ex",
      reportNumber   = "DESY-12-045",
      SLACcitation   = "%%CITATION = ARXIV:1205.6153;%%"
}'
