EPJ Web of Conferences 71, 00032 (2014)
https://doi.org/10.1051/epjconf/20147100032

Exclusive production of W pairs in CMS

Centre for Cosmology, Particle Physics and Phenomenology (CP3), Université Catholique de Louvain UCL, Belgium

^a e-mail: gustavo.silveira@cern.ch

Published online: 29 April 2014

Abstract

We report the results on the search for exclusive production of W pairs in the LHC with data collected by the Compact Muon Solenoid detector in proton-proton collisions at √s = 7 TeV. The analysis comprises the two-photon production of a W pairs, pp → pW⁺ W⁻ p → p νe^± νµ^∓ p. Two events are observed in data for p_T(ℓ) > 4 GeV, |η(ℓ)| < 2.4 and m(µ^± e^∓) > 20 GeV, in agreement with the standard model prediction of 2.2 ± 0.4 signal events with 0.84 ± 0.15 background events. Moreover, a study of the tail of the lepton pair transverse momentum distribution is performed to search for an evidence of anomalous quartic gauge couplings in the γγ → W⁺ W⁻ vertex. As no events are observed in data, it results in a model-independent upper limits for the anomalous W quartic gauge couplings a^W_0,C/Λ², which are of the order of 10⁻⁴.