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Evaluation of the strong coupling constant α S using the ATLAS inclusive jet cross-section data

  • Regular Article - Experimental Physics
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Abstract

We perform a determination of the strong coupling constant using the latest ATLAS inclusive jet cross section data, from proton–proton collisions at \(\sqrt{s}=7~\mathrm{TeV}\), and their full information on the bin-to-bin correlations. Several procedures for combining the statistical information from the different data inputs are studied and compared. The theoretical prediction is obtained using NLO QCD, and it also includes non-perturbative corrections. Our determination uses inputs with transverse momenta between 45 and 600 GeV, the running of the strong coupling being also tested in this range. Good agreement is observed when comparing our result with the world average at the Z-boson scale, as well as with the most recent results from the Tevatron.

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Notes

  1. This model of the distributions is motivated by the origin of the asymmetric uncertainties, due to the shape of the p T spectra. However, as explained later, other possible models of these distributions have been tested.

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Acknowledgements

We thank T. Carli for numerous discussions as well as a careful reading of this manuscript. We acknowledge A. Cooper-Sarkar, C. Doglioni, A. Glazov and A. Hoecker for helpful discussions. We benefited from the feedback of the ATLAS PDF forum and the ATLAS jet physics group on our study. We gratefully acknowledge ATLAS Physics Coordination and ATLAS management for fruitful discussions and continuous support.

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Authors and Affiliations

  1. CERN, 1211, Geneva 23, Switzerland

    B. Malaescu

  2. DESY, Notkestraße 85, 22607, Hamburg, Germany

    P. Starovoitov

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  1. B. Malaescu
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  2. P. Starovoitov
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Correspondence to B. Malaescu.

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Malaescu, B., Starovoitov, P. Evaluation of the strong coupling constant α S using the ATLAS inclusive jet cross-section data. Eur. Phys. J. C 72, 2041 (2012). https://doi.org/10.1140/epjc/s10052-012-2041-y

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