A continuous-spin photon would let forbidden atomic transitions, such as hydrogen 2s to 1s, proceed via single-photon emission, with rates suppressed by powers of ρα/ω and a laboratory bound ρ≲0.1 eV.
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Probing "Continuous Spin" QED with Rare Atomic Transitions
A continuous-spin photon would let forbidden atomic transitions, such as hydrogen 2s to 1s, proceed via single-photon emission, with rates suppressed by powers of ρα/ω and a laboratory bound ρ≲0.1 eV.