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the Higgs boson decays into a Z boson and a photon

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The Higgs boson, discovered in 2012 at CERN's Large Hadron Collider (LHC), can decay into various particles, including pairs of photons, W bosons, and Z bosons
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A rare decay of the Higgs boson that has recently gained attention is its decay into a Z boson and a photon (Zγ)
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According to the Standard Model, only 0.15% of Higgs bosons decay to Zγ, a rate comparable to the Higgs-boson decay to two photons
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This decay is of particular interest to physicists as it proceeds through processes that could provide insights into both physics beyond the Standard Model and the nature of the Higgs boson
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The decay of the Higgs boson into a Z boson and a photon is similar to that of a decay into two photons
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In these processes, the Higgs boson does not decay directly into these pairs of particles; instead, the decays proceed via an intermediate "loop" of “virtual” particles that pop in and out of existence
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In May 2023, the ATLAS and CMS Collaborations at CERN reported the first evidence of the Higgs boson decay to a Z boson and a photon, with a statistical significance of 3.4 standard deviations
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This result was 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 LHC from 2015 to 2018
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The measured signal rate, relative to the Standard Model prediction, is 2.2 ± 0.7 and agrees with the prediction
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