Evidence for the Higgs Boson Decay to a Z Boson and a Photon at the LHC

G. Aad, T.P.A. Åkesson, C. Doglioni, V. Hedberg, H. Herde, B. Konya, E. Lytken, R. Poettgen, N.D. Simpson, O. Smirnova, I. Zhizhin, A. Zhokin, ATLAS Collaboration

Research output: Contribution to journalArticlepeer-review


The first evidence for the Higgs boson decay to a Z boson and a photon is presented, with a statistical significance of 3.4 standard deviations. The result is derived from a combined analysis of the searches performed by the ATLAS and CMS Collaborations with proton-proton collision datasets collected at the CERN Large Hadron Collider (LHC) from 2015 to 2018. These correspond to integrated luminosities of around 140  fb^{-1} for each experiment, at a center-of-mass energy of 13 TeV. The measured signal yield is 2.2±0.7 times the standard model prediction, and agrees with the theoretical expectation within 1.9 standard deviations.
Original languageEnglish
Article number021803
JournalPhysical Review Letters
Issue number2
Publication statusPublished - 2024

Subject classification (UKÄ)

  • Subatomic Physics

Free keywords

  • article
  • boson
  • controlled study
  • human
  • major clinical study
  • photon


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