  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 data sets 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 $2.2\pm0.7$ times
the Standard Model prediction, and agrees with the theoretical expectation
within 1.9 standard deviations.
