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| CMS-PAS-EXO-22-007 | ||
| Search for excited tau leptons in the $ \tau\tau\gamma $ final state in pp collisions at $ \sqrt{s}= $ 13 TeV | ||
| CMS Collaboration | ||
| 5 June 2024 | ||
| Abstract: We report the results of a test of the compositeness of the heaviest charged lepton, $ \tau $, using data collected in proton-proton collisions at a center of mass energy of 13 TeV at the Large Hadron Collider at CERN in 2016--2018, corresponding to an integrated luminosity of 138 fb$ ^{-1} $. We seek tau lepton pair production in which one tau lepton is produced in an excited state and decays to a ground state tau lepton and photon. The analysis selects events with two isolated tau lepton decay candidates plus a high energy photon. The mass of the excited tau lepton is reconstructed using the missing transverse momentum in the event, assuming the momentum of the neutrinos from each tau lepton decay lie along the visible tau lepton decay product direction. We observe no excess of events above the standard model background prediction and use this null result to set lower bounds on the excited tau lepton mass. For a compositeness scale $ \Lambda $ equal to the excited tau lepton mass (10 TeV), we exclude excited tau leptons with masses below 4700 GeV (2800 GeV). | ||
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Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to JHEP. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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