Search for excited leptons in $\ell \ell \gamma$ final states in proton-proton collisions at $\sqrt{s}=$ 13 TeV

Abstract

A search is presented for excited electrons and muons in $\ell \ell \gamma$ final states at the LHC. The search is based on a data sample corresponding to an integrated luminosity of 35.9 fb${}^{-1}$ of proton-proton collisions at a center-of-mass energy of 13 TeV, collected with the CMS detector in 2016. This is the first search for excited leptons at $\sqrt{s}=$ 13 TeV. The observation is consistent with the standard model background prediction, and the most stringent exclusion limits to date are set on the excited lepton mass and the compositeness scale, at 95% confidence level. Excited electrons and muons are excluded for masses below 3.9 and 3.8 TeV, respectively, under the assumption that the excited lepton mass equals the compositeness scale. The best observed limit on the compositeness scale is obtained with an excited lepton mass of around 1.0 TeV, excluding values below 25 TeV for both excited electrons and muons.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/EXO-18-004 (CMS Public Pages)

References in corpus (14)

• 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
• Particle-flow reconstruction and global event description with the CMS detector
• The CMS trigger system
• MCFM for the Tevatron and the LHC
• Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at sqrt(s) = 8 TeV
• Performance of the CMS muon detector and muon reconstruction with proton-proton collisions at $\sqrt{s}=$ 13 TeV
• ZZ production at hadron colliders in NNLO QCD
• $W^{+}{W}^{-}$ production at hadron colliders in NNLO QCD
• Search for high-mass resonances in dilepton final states in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Search for excited electrons in ppbar collisions at sqrt(s) = 1.96 TeV
• Quark Excitations Through the Prism of Direct Photon Plus Jet at the LHC
• Search for Excited Muons in ppbar Collisions at sqrt(s) = 1.96 TeV
• Search for Excited Quarks in $q\bar{q}\to \gamma \gamma$ at the LHC

Cited by in corpus (2)

• Search for excited electrons singly produced in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS experiment at the LHC
• Search for an excited lepton that decays via a contact interaction to a lepton and two jets in proton-proton collisions at $\sqrt{s}=$ 13 TeV