Regular Article - Theoretical Physics
Study of the interactions of the axion with mesons and photons using a chiral effective Lagrangian model
Dipartimento di Fisica, Università di Pisa, and INFN, Sezione di Pisa, Largo Pontecorvo 3, 56127, Pisa, Italy
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Accepted: 16 March 2020
Published online: 3 April 2020
We investigate the most interesting decay processes involving axions, photons and the lightest pseudoscalar mesons, making use of a chiral effective Lagrangian model with light quark flavors, which also includes the flavor-singlet pseudoscalar meson and implements the U(1) axial anomaly of the fundamental theory. In particular, we compute the electromagnetic coupling of the axion to photons and we compare our result with the prediction of the Chiral Effective Lagrangian with light quark flavors. Moreover, we study the decay channels and we estimate the corresponding decay widths, using the existing bounds on the breaking scale.
© The Author(s), 2020