Evidence for WW/WZ vector boson scattering in the decay channel lνqq produced in association with two jets in proton-proton collisions at √s=13TeV
Document Type
Article
Publication Date
11-1-2022
Abstract
Evidence is reported for electroweak (EW) vector boson scattering in the decay channel l nu qq of two weak vector bosons WV(V = Wor Z), produced in association with two parton jets. The search uses a data set of proton-proton collisions at 13TeVcollected with the CMS detector during 2016-2018 with an integrated luminosity of 138fb(-1). Events are selected requiring one lepton (electron or muon), moderate missing transverse momentum, two jets with a large pseudorapidity separation and a large dijet invariant mass, and a signature consistent with the hadronic decay of a W/Zboson. The cross section is computed in a fiducial phase space defined at parton level requiring all parton transverse momenta p(T)> 10 GeVand at least one pair of outgoing partons with invariant mass mqq> 100 GeV. The measured and expected EW WVproduction cross sections are 1.90(-0.46)(+0.5)3 pb and 2.23(-0.11)(+0.08)(scale) +/- 0.05(PDF) pb, respectively, where PDF is the parton distribution function. The observed EW signal strength is mu EW= 0.85 +/- 0.12 (stat)(-0.17)(+0.19)(syst), corresponding to a signal significance of 4.4 standard deviations with 5.1 expected, and it is measured keeping the quantum chromodynamics (QCD) associated diboson production fixed to the standard model prediction. This is the first evidence of vector boson scattering in the l nu qq decay channel at LHC. The simultaneous measurement of the EW and QCD associated diboson production agrees with the standard model prediction. (C) 2022 The Author(s). Published by Elsevier B.V.
Keywords
CMS, Vector boson scattering
Divisions
PHYSICS
Funders
BMBWF (Austria),Austrian Science Fund (FWF),Fonds de la Recherche Scientifique - FNRS,FWO,Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ),Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES),Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio De Janeiro (FAPERJ),Fundacao de Amparo a Ciencia e Tecnologia do Estado do Rio Grande do Sul (FAPERGS),Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP),MES (Bulgaria),BNSF (Bulgaria),CERN,Chinese Academy of Sciences,Ministry of Science and Technology, China,National Natural Science Foundation of China (NSFC),MINCIENCIAS (Colombia),MSES (Croatia),CSF (Croatia),RIF (Cyprus),SENESCYT (Ecuador),MoER (Estonia),European Research Council (ERC),Marie Curie Actions European Union (EU),Research Council of Finland
Publication Title
Physics Letters B
Volume
834
Publisher
Elsevier
Publisher Location
RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS