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, ET jet, for jets with ET jet > 17 GeV and pseudorapidity -1 <ηjet <2.5, in the γp centre-of-mass-energy range 142 < Wγp < 293 GeV. Scaled jet invariant cross sections are presented as a function of the dimensionless variable xT ≡ 2ET jet/Wγp for (Wγp) = 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 (Wγp) values shows clear non-scaling behaviour. A value for the strong coupling constant of αs(MZ) = 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 dσ/dET jet. The variation of αs with ET jet is in good agreement with the running of αs as predicted by QCD.
|Titolo:||Scaling Violations and Determination of alfa strong from Jet Production in gamma-p Interactions at HERA|
|Data di pubblicazione:||2003|
|Appare nelle tipologie:||1.1.1 Articolo su rivista con DOI|