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

G Aad¹, B Abbott², K Abeling³

¹CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France.

Physical Review Letters

|January 26, 2024

Abstract:

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.

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