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2018

Enhanced axion-photon coupling in GUT with hidden photon

Daido, Ryuji, Takahashi, Fuminobu, Yokozaki, Norimi

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We show that the axion coupling to photons can be enhanced in simple models with a single Peccei-Quinn field, if the gauge coupling unification is realized by a large kinetic mixing $\chi = {\cal O}(0.1)$ between hypercharge and unbroken hidden U(1)$_H$.

The key observation is that the U(1)$_H$ gauge coupling should be rather strong to induce such large kinetic mixing, leading to enhanced contributions of hidden matter fields to the electromagnetic anomaly.
We find that the axion-photon coupling is enhanced by about a factor of 10-100 with respect to the GUT-axion models with $E/N = 8/3$.

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