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Next-to-leading order electroweak corrections to pp → W+W− → 4 leptons at the LHC in double-pole approximation

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Abstract

We present the calculation of next-to-leading-order electroweak corrections to W-boson pair production at the LHC, taking off-shell effects of the W bosons and their leptonic decays into account in the framework of the so-called double-pole approximation. In detail, the lowest-order cross section and the photonic bremsstrahlung are based on full matrix elements with four-fermion final states, but the virtual one-loop corrections are approximated by the leading contributions of a systematic expansion about the resonance poles of the two W bosons. This expansion classifies the virtual corrections into factorizable and non-factorizable corrections, the calculation of which is described in detail. Corrections induced by photons in the initial state, i.e. photon-photon and quark-photon collision channels, are included and based on complete matrix elements as well. Our numerical results, which are presented for realistic acceptance cuts applied to the W-boson decay products, qualitatively confirm recent results obtained for on-shell W bosons and reveal electroweak corrections of the size of tens of percent in the TeV range of transverse momenta and invariant masses. In general, photon-photon and quark-photon induced contributions amount to 5−10% of the full differential result. Compared to previous predictions based on stable W bosons electroweak corrections, however, can change by several percent because of realistic cuts on the W-boson decay products and corrections to the decays.

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Authors and Affiliations

  1. PRISMA Cluster of Excellence & Institute of Physics, Johannes Gutenberg University, Staudingerweg 7, 55099, Mainz, Germany

    M. Billoni & B. Jäger

  2. Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104, Freiburg, Germany

    S. Dittmaier & C. Speckner

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  1. M. Billoni
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Billoni, M., Dittmaier, S., Jäger, B. et al. Next-to-leading order electroweak corrections to pp → W+W− → 4 leptons at the LHC in double-pole approximation. J. High Energ. Phys. 2013, 43 (2013). https://doi.org/10.1007/JHEP12(2013)043

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  • DOI: https://doi.org/10.1007/JHEP12(2013)043

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