Abstract
Neutrinos may be the harbingers of new dark sectors, since the renormalizable neutrino portal allows for their interactions with hidden new physics. We propose here to use this fact to connect the generation of neutrino masses to a light dark sector, charged under a new U(1)D dark gauge symmetry. We introduce the minimal number of dark fields to obtain an anomaly free theory with spontaneous breaking of the dark symmetry, and obtain automatically the inverse seesaw Lagrangian. In addition, the so-called μ-term of the inverse seesaw is dynamically generated and technically natural in this framework. As a bonus, the new light dark gauge boson can provide a possible explanation to the MiniBooNE anomaly.
Highlights
One of the most surprising experimental results of the last decades has been the discovery of tiny neutrino masses and relatively large neutrino mixings
Non-vanishing neutrino masses are a clear indication of physics beyond the Standard Model (SM), the mechanism and the scales responsible for the neutrino mass generation remain a total mystery
We are able to lower the scale of neutrino mass generation below the electroweak one by resorting to a dynamical gauge symmetry breaking of this new sector
Summary
One of the most surprising experimental results of the last decades has been the discovery of tiny neutrino masses and relatively large neutrino mixings. A more ‘natural’ way to generate neutrino masses involve the addition of new states that, once integrated out, generate the dimension five Weinberg operator c This is embodied by the so-called seesaw mechanisms [1,2,3,4]. The smallness of neutrino masses relative to the weak scale implies either that the scale of new physics Λ is very large (making it impossible to experimentally discriminate the different seesaw mechanisms), or that the Wilson coefficient c is extremely small (for instance, coming from loop effects involving singly or doubly charged scalars [5]). In this letter we propose to use such a portal to explicitly connect a new light dark sector with the generation of neutrino masses In this way, we are able to lower the scale of neutrino mass generation below the electroweak one by resorting to a dynamical gauge symmetry breaking of this new sector. This scheme has several phenomenological consequences at lower energies, and in particular it offers a natural explanation for the long-standing excess of electron-like events reported by the MiniBooNE collaboration [14, 15]
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