Search for evidence of the type-III seesaw mechanism in multilepton final states in proton-proton collisions at sqrt(s) = 13 TeV

Abstract

A search for a signal consistent with the type-III seesaw mechanism in events with three or more electrons or muons is presented. The data sample consists of proton-proton collisions at sqrt(s) = 13 TeV collected by the CMS experiment at the LHC in 2016 and corresponds to an integrated luminosity of 35.9 inverse femtobarns. Selection criteria based on the number of leptons and the invariant mass of opposite-sign lepton pairs are used to distinguish the signal from the standard model background. The observations are consistent with the expectations from standard model processes. The results are used to place limits on the production of heavy fermions of the type-III seesaw model as a function of the branching ratio to each lepton flavor. In the scenario of equal branching fractions to each lepton flavor, heavy fermions with masses below 840 GeV are excluded. This is the most sensitive probe to date of the type-III seesaw mechanism.

Replaced with the published version. All the figures and tables, including additional supplementary figures and tables, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/EXO-17-006 (CMS Public Pages)

References in corpus (15)

• PYTHIA 6.4 Physics and Manual
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• An Introduction to PYTHIA 8.2
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• Particle-flow reconstruction and global event description with the CMS detector
• The CMS trigger system
• Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at sqrt(s) = 8 TeV
• Distinguishing seesaw models at LHC with multi-lepton signals
• Type-III see-saw at LHC
• Performance of the CMS missing transverse energy reconstruction in pp data at sqrt(s) = 8 TeV
• Electroweak scale seesaw and heavy Dirac neutrino signals at LHC
• Measurement of the t t-bar production cross section in the dilepton channel in pp collisions at sqrt(s) = 7 TeV
• Search for heavy lepton partners of neutrinos in proton-proton collisions in the context of the type III seesaw mechanism
• Type III Seesaw and Left-Right Symmetry
• Phenomenology in Minimal Cascade Seesaw for Neutrino Mass

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