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Multijet production in neutral current deep inelastic scattering at HERA and determination of alpha(s)

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Piotrzkowski, Krzysztof [UCL] Chekanov, S. de Favereau, J. [UCL]

(eng) Multijet production rates in neutral current deep inelastic scattering have been measured in the range of exchanged boson virtualities 10 < Q2 < 5000 GeV2. The data were taken at the ep collider HERA with centre-of-mass energy sqrt(s) = 318 GeV using the ZEUS detector and correspond to an integrated luminosity of 82.2 pb-1. Jets were identified in the Breit frame using the k_T cluster algorithm in the longitudinally invariant inclusive mode. Measurements of differential dijet and trijet cross sections are presented as functions of jet transverse energy E_{T,B}{jet}, pseudorapidity eta_{LAB}{jet} and Q2 with E_{T,B}{jet} > 5 GeV and -1 < eta_{LAB}{jet} < 2.5. Next-to-leading-order QCD calculations describe the data well. The value of the strong coupling constant alpha_s(M_Z), determined from the ratio of the trijet to dijet cross sections, is alpha_s(M_Z) = 0.1179 pm 0.0013(stat.) {+0.0028}_{-0.0046}(exp.) {+0.0064}_{-0.0046}(th.) Comment: 22 pages, 5 figures

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 2005
Journal information "European Physical Journal C. Particles and Fields" - Vol. 44, p. 183-193 (2005)
Publisher Springer (Heidelberg)
issn 1434-6044
e-issn 1434-6052
Publication status Publié
Affiliation UCL
Keywords High Energy Physics - Experiment
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Bibliographic reference Piotrzkowski, Krzysztof ; Chekanov, S. ; de Favereau, J. ; et. al. Multijet production in neutral current deep inelastic scattering at HERA and determination of alpha(s). In: European Physical Journal C. Particles and Fields, Vol. 44, p. 183-193 (2005)
Permanent URL http://hdl.handle.net/2078/31920