Neutrinos,axions and conformal symmetry |
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Authors: | Krzysztof A Meissner Hermann Nicolai |
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Institution: | (1) Institute of Theoretical Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland;(2) Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Mühlenberg 1, 14476 Potsdam, Germany |
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Abstract: | We demonstrate that radiative breaking of conformal symmetry (and simultaneously electroweak symmetry) in the standard model
with right-chiral neutrinos and a minimally enlarged scalar sector induces spontaneous breaking of lepton number symmetry,
which naturally gives rise to an axion-like particle with some unusual features. The couplings of this ‘axion’ to standard
model particles, in particular photons and gluons, are entirely determined (and computable) via the conformal anomaly, and
their smallness turns out to be directly related to the smallness of the masses of the light neutrinos. |
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