Confronting a New Three-loop Seesaw Model with the 750 GeV Diphoton Excess

Abstract

We propose a new type of radiative neutrino model with a local hidden $U(1)$ symmetry, in which neutrino masses are induced at the three loop level, and discuss the muon anomalous magnetic moment, and dark matter candidates therein. By allowing the hypercharges larger than 3/2 for new fields that contribute to the neutrino masses and making them decay into the standard model fields appropriately, we introduce a lot of new particles with multiple electrical charges in a natural manner. As a by-product, we can accommodate the 750 GeV diphoton excess depending on the hypercharge quantum numbers of new fields responsible for the neutrino masses at the three loop level.

34 pages, 9 figures, 1 table. arXiv admin note: text overlap with arXiv:1601.07339, arXiv:1601.04516, version to appear in PRD

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