Measurement of αs from jet rates in deep inelastic scattering at HERAстатья
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Аннотация:Jet production in deep inelastic scattering for 120 < View the MathML source2 < 3600 GeV2 has been studied using data from an integrated luminosity of 3.2 pb−1 collected with the ZEUS detector at HERA. Jets are identified with the JADE algorithm. A cut on the angular distribution of parton emission in the View the MathML source centre-of-mass system minimises the experimental and theoretical uncertainties in the determination of the jet rates. The jet rates, when compared to View the MathML source(αs2) perturbative QCD calculations, allow a precise determination of αs(View the MathML source) in three View the MathML source2-intervals. The values are consistent with a running of ifαs(View the MathML source), as expected from QCD. Extrapolating to View the MathML source = MZ0αs(MZ0) = 0.117 ± 0.005 (stat) −0.005+0.004 (systexp) ± 0.007 (systtheory).