Observation of electroweak W+W− pair production in association with two jets in proton-proton collisions at [formula omitted

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Gribushin ,M R Di Domenico ,A Dermenev ,G B Yu ,D Beghin ,P Vanlaer ,Jan-Ole Gosewisch ,N V Tran ,J Niedziela ,G Correia Silva ,A Schmidt ,Y Sirois ,E Carrera Jarrin ,S Ko ,A Babaev ,M Kilpatrick ,P Jarry ,Y Feng ,A Aleksandrov ,A Santocchia ,C Martínez-Rivero ,H Kaur ,J Bueghly ,M Paganoni ,S Beauceron ,S Sawant ,K Cankoçak ,M Pelliccioni ,S Volkov ,C Asawatangtrakuldee ,V Sordini ,V Papadimitriou ,E Vourliotis ,M Quinnan ,A Buchot Perraguin ,F Meijers ,Z Demiragli ,A Droll ,R Lee ,Z.-A Liu ,G Mestdach ,Christina Wang ,P Salvini ,F García ,T Camporesi ,W Lange ,J Dolen ,R Aly ,B Vermassen ,K Nash ,S Wertz ,A Mohammadi ,E Pérez ,L Pétré ,D Pitzl ,B Caraway ,E Appelt ,I Dutta ,Y Ban ,A Lelek ,J Königsberg ,G Zumerle ,R Lipton ,Filippo Marini ,W Snoeys ,A.-M Lyon ,P Petkov ,A Brinkerhoff ,A Datta ,O Toldaiev ,S Wimpenny ,D D’enterria ,A De Roeck ,Y Lai ,I Papadopoulos ,C Grab ,Emine Gurpinar Guler ,K Harder ,F Fallavollita ,Tao Huang ,S Nuzzo ,C Erice ,W Carvalho ,K Liyanage ,A Zhokin

doi:10.1016/j.physletb.2022.137495

Abstract

An observation is reported of the electroweak production of a W+W− pair in association with two jets, with both W bosons decaying leptonically. The data sample corresponds to an integrated luminosity of 138fb−1 of proton-proton collisions at s=13TeV, collected by the CMS detector at the CERN LHC. Events are selected by requiring exactly two opposite-sign leptons (electrons or muons) and two jets with large pseudorapidity separation and high dijet invariant mass. Events are categorized based on the flavor of the final-state leptons. A signal is observed with a significance of 5.6 standard deviations (5.2 expected) with respect to the background-only hypothesis. The measured fiducial cross section is 10.2±2.0fb and this value is consistent with the standard model prediction of 9.1±0.6fb.

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