Neutrino Mixing and the Axion-Gluon Vertex

Details Neutrino Mixing and the Axion-Gluon Vertex Neutrino Mixing and the Axion-Gluon Vertex

2012-03-17

arxiv.org/abs/1203.3886v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

34 pages, 10 figures

Scientific paper

We present detailed arguments and calculations in support of our recent proposal to identify the axion arising in the solution of the strong CP problem with the Majoron, the (pseudo-)Goldstone boson of spontaneously broken lepton number symmetry. At low energies, the associated $U(1)_L$ becomes, via electroweak parity violation and neutrino mediation, indistinguishable from an axial Peccei-Quinn symmetry in relation to the strong interactions. The axionic couplings are then fully computable in terms of known SM parameters and the Majorana mass scales. The determination of these couplings involves certain three-loop diagrams, with a UV finite neutrino triangle taking over the role of the usual triangle anomaly.

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