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High Energy Physics Seminar

Monday, April 11, 2022
4:00pm to 5:00pm
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Online Event
The axion-photon coupling and grand unified theories
Mario Reig, Oxford University,

Being topological quantities, the axion couplings to gauge bosons contain important information about the UV. Among them, the axion-photon coupling is of particular interest experimentally. In this talk I show how in Grand Unified Theories, and in the massless axion limit, only the QCD axion couples to photons. More generally - and due to kinetic or mass mixing - additional, light axion-like particles can appear but with an enormously suppressed coupling to photons.

The talk is in 469 Lauritsen.

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