Four-lepton Z boson decay constraints on the standard model EFT

Radja Boughezal, Chien Yi Chen, Frank Petriello, Daniel Wiegand

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


We discuss how four-lepton decays of the Z boson probe currently unconstrained flat directions in the parameter space of the standard model effective field theory (SMEFT). We derive the constraints from these decays on four-lepton operators in the SMEFT and show how the LHC data for this process complements probes from neutrino-trident production. Future differential measurements with high-luminosity data can strongly constrain four-lepton operators and remove all flat directions in the four-muon sector of the SMEFT. We comment briefly on the possibility of using rare Z-decays to τ-leptons to probe untested directions in the SMEFT parameter space.

Original languageEnglish (US)
Article number055015
JournalPhysical Review D
Issue number5
StatePublished - Mar 19 2021

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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