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NLO+NLL limits on W′ and Z′ gauge boson masses in general extensions of the Standard Model

By United Kingdom L69 3BX Liverpool University of Liverpool TomášDepartment of Mathematical Sciences Ježo, Germany) Münster D-48149 Wilhelm-Klemm-Straße 9 Westfälische Wilhelms-Universität Münster Michael(Institut für Theoretische Physik Klasen, Germany) Münster D-48149 Wilhelm-Klemm-Straße 9 Westfälische Wilhelms-Universität Münster David(Institut für Theoretische Physik Lamprea, France) Grenoble F-38026 53 Avenue des Martyrs Université Joseph Fourier/CNRS-IN2P3/INPG Florian(Laboratoire de Physique Subatomique et de Cosmologie Lyonnet and France) Grenoble F-38026 53 Avenue des Martyrs Université Joseph Fourier/CNRS-IN2P3/INPG Ingo(Laboratoire de Physique Subatomique et de Cosmologie Schienbein

Abstract

QCD resummation predictions for the production of charged ( W ′ ) and neutral ( Z ′ ) heavy gauge bosons decaying leptonically are presented. The results of our resummation code at next-to-leading order and next-to-leading logarithmic (NLO+NLL) accuracy are compared to Monte Carlo predictions obtained with PYTHIA at leading order (LO) supplemented with parton showers (PS) and FEWZ at NLO and next-to-next-to-leading order (NNLO) for the p T -differential and total cross sections in the Sequential Standard Model (SSM) and general SU(2)×SU(2)×U(1) models. The LO+PS Monte Carlo and NNLO fixed-order predictions are shown to agree approximately with those at NLO+NLL at small and intermediate p T , respectively, and the importance of resummation for total cross sections is shown to increase with the gauge boson mass. The theoretical uncertainties are estimated by variations of the renormalisation/factorisation scales and of the parton densities, the former being significantly reduced by the resummation procedure. New limits at NLO+NLL on W ′ and Z ′ boson masses are obtained by reinterpreting the latest ATLAS and CMS results in general extensions of the Standard Model

Year: 2014
DOI identifier: 10.1007/JHEP12(2014)092
OAI identifier: oai:www.openaccessrepository.it:10343

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