Determination of the strong coupling constant using subjet multiplicities in Neutral Current Deep Inelastic Scattering

Details Determination of the strong coupling constant using subjet multiplicities in Neutral Current Deep Inelastic Scattering Determination of the strong coupling constant using subjet multiplicities in Neutral Current Deep Inelastic Scattering

2001-11-22

arxiv.org/abs/hep-ex/0111072v1

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 2 figures, to be published in the Proceedings of the DIS-2001 Workshop

Scientific paper

The internal structure of the jets produced in neutral current interactions for Q^2>125 GeV^2 has been studied using the subjet multiplicity with the ZEUS detector at HERA. Jets are identified in the laboratory frame by applying the longitudinally invariant k_T-cluster algorithm. Next-to-leading order QCD calculations have been obtained and compared to the data; a good agreement has been observed in the region where hadron-to-parton corrections are small, E_{T,jet}> 25 GeV. In this region, the strong coupling constant is extracted and the resulting value is alpha_s (M_Z)=0.1185 +/- 0.0016 (stat.) ^{+0.0067}_{-0.0048} (syst.) ^{+0.0089}_{-0.0071} (th.).

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