Determination of the strong coupling constant using subjet multiplicities in Neutral Current Deep Inelastic Scattering
O. Gonzalez
Abstract
The internal structure of the jets produced in neutral current interactions for Q2>125 GeV2 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 kT-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, ET,jet> 25 GeV. In this region, the strong coupling constant is extracted and the resulting value is alphas (MZ)=0.1185 +/- 0.0016 (stat.) +0.0067-0.0048 (syst.) +0.0089-0.0071 (th.).
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