Search for excited leptons in γ\ell\ell\gamma final states in proton-proton collisions at the HL-LHC

Collaboration
2019
10 pages
  • Published: 2019
Report number:
  • CMS-PAS-FTR-18-029
Experiments:

Citations per year

20172018201901
Abstract: (CDS)
A search for excited leptons (electrons and muons) is presented, using simulation of the upgraded CMS detector at the High-Luminosity LHC (HL-LHC). Excited leptons are predicted by many theories beyond the standard model (SM) where quarks and leptons are not elementary but instead are themselves composite objects. Excited leptons (=e,μ\ell^* = e^*, \mu^*) in γ\ell\ell\gamma (=e,μ\ell= e, \mu) final states where the excited lepton decays to a SM lepton and a photon (γ\ell^*\rightarrow\ell\gamma) are studied. The main background is Drell-Yan production in association with a photon. The HL-LHC environment (a centre of mass energy of 14 TeV and an integrated luminosity of 3000 fb1^{-1}) allows for an extension of the discovery potential for excited leptons. The analysis is optimised for HL-LHC conditions, and indicates that 5σ5\sigma discovery of excited leptons is possible for masses up to 5.1 TeV. If no significant discrepancies are seen in the data, excited leptons with masses below 5.8 TeV could be excluded at 95%\% confidence level. This document has been revised with respect to the version dated December 17, 2018.\textit{This document has been revised with respect to the version dated December 17, 2018.}
Note:
  • Preliminary results
  • Data
  • p p: colliding beams
  • CERN LHC Coll: upgrade
  • new physics: search for
  • p p: scattering
  • e*: radiative decay
  • muon: excited state
  • photon: final state
  • Drell-Yan process
  • background