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Multi-jet production in high Q2 neutral current deeply inelastic scattering at HERA and determination of alpha_s |
| Reference |
T. Kluge, presented at DIS2005, Spring 2005 |
| Document |
Conference paper or talk
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| Contact |
P. Prideaux |
| Abstract |
Deep-inelastic e+p scattering data, taken with the H1 detector at HERA, are used to investigate jet production over a range of four-momentum transfers 150 < Q2 < 15000 GeV2 and transverse jet energies 5 < ET < 50 GeV. The analysis is based on data corresponding to an integrated luminosity of Lint = 65.4 pb-1 taken in the years 1999-2000 at a centre-of-mass energy sqrt(s) ~ 319 GeV. Jets are defined by the inclusive k_t algorithm in the Breit frame of reference. Dijet and trijet jet cross sections are measured with respect to the exchanged boson virtuality and in addition the ratio of the trijet to the dijet cross section R_{3/2} is investigated. The results are compared to the predictions of perturbative QCD calculations in next-to-leading order in the strong coupling constant alphas. The value of alphas(MZ) determined from the study of R_{3/2}, is alphas(MZ) = 0.1175 +- 0.0017 (stat.) +- 0.0050 (syst.) {+0.0054}_{-0.0068} (th.). |
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