Gauged Lμ-Lτ Symmetry at the Electroweak Scale

By J. Heeck, W. Rodejohann. 2011

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The extension of the standard model by a spontaneously broken abelian gauge group based on the ${L}_{\ensuremath{\mu}}\ensuremath{-}{L}_{\ensuremath{\tau}}$ lepton number can resolve the long-standing discrepancy between experimental and theoretical values for the magnetic moment of the muon. It furthermore naturally generates $\ensuremath{\mu}\mathrm{\text{\ensuremath{-}}}\ensuremath{\tau}$ symmetric lepton mixing, introduces neutrino nonstandard interactions, and the associated gauge boson ${Z}^{\ensuremath{'}}$ serves as a mediator to the right-handed neutrino sector. A detailed fit to electroweak data is performed to identify the allowed values for the mass of ${Z}^{\ensuremath{'}}$ and its mixing with the standard model $Z$. An economical new scalar sector is constructed that spontaneously breaks ${L}_{\ensuremath{\mu}}\ensuremath{-}{L}_{\ensuremath{\tau}}$ and leads to experimental consequences such as lepton flavor violation and collider signatures. Furthermore we discuss the nonabelian extension to an $SU(2{)}^{\ensuremath{'}}$, particularly the neutrino sector.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/56335b00ef640e0063d00641c6a97f5eb1fcc0d4

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In Nuclear and High Energy Physics

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Neutrino non-standard interactions: A status report (2019, background): “These models have connections to the flavour structure in neutrino mixing if right-handed neutrinos are introduced for neutrino mass generation via the Type-I seesaw mechanism [332], and so also may also shed light on the origin of neutrino masses.”