CP violation and circular polarisation in neutrino radiative decay

Abstract

The radiative decay of neutral fermions has been studied for decades but $CP$ violation induced within such a paradigm has evaded attention. $CP$ violation in these processes can produce an asymmetry between circularly polarised directions of the radiated photons and produces an important source of net circular polarisation in particle and astroparticle physics observables. The results presented in this work outlines the general connection between $CP$ violation and circular polarisation for both Dirac and Majorana fermions and can be used for any class of models that produce such radiative decays. The total $CP$ violation is calculated based on a widely studied Yukawa interaction considered in both active and sterile neutrino radiative decay scenarios as well as searches for dark matter via direct detection and collider signatures. Finally, the phenomenological implications of the formalism on keV sterile neutrino decay, leptogenesis-induced right-handed neutrino radiative decay and IceCube-driven heavy dark matter decay are discussed.

arXiv comment25 pages, 3 figures, discussions added, published in JHEP

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• Neutrino Portals, Terrestrial Upscattering, and Atmospheric Neutrinos
• Dipole-Coupled Neutrissimo Explanations of the MiniBooNE Excess Including Constraints from MINERvA Data
• Asymmetry in flavour changing electromagnetic transitions of vector-like quarks
• CP violation in neutral lepton transition dipole moment
• Probing active-sterile neutrino transition magnetic moments at LEP and CEPC
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• Testing Neutrino Dipole Portal by Long-lived Particle Detectors at the LHC
• Leptonic CP violation from a vector-like lepton
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