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We chart the theoretical basis of radiative decays of the Higgs boson, $H \to\gamma\gamma$ and $Z\gamma$, for measuring the spin of the Higgs particle.These decay channels are complementary to other rare modes such as real/virtual$Z$-boson pair-decays. In systematic helicity analyses the angular distributionfor zero-spin is confronted with hypothetical spin-$2^\pm$ and higherassignments to quantify the sensitivity.

Theoretical Basis of Higgs-Spin Analysis in $H \to \gamma\gamma$ and $Z\gamma$ Decays