Muon $g-2$ and non-thermal leptogenesis in $U(1{)}_{L_{\mu }-L_{\tau }}$ model

Abstract

The gauged $U(1{)}_{L_{\mu }-L_{\tau }}$ symmetry is the simplest possibility to explain the observed muon $g-2$, while being consistent with the neutrino oscillations through the seesaw mechanism. In this paper, we investigate if leptogenesis can work at the same time. At first glance, leptogenesis seems challenging because the right-handed neutrino masses are related to the $U(1{)}_{L_{\mu }-L_{\tau }}$ breaking scale of $10$-$100$GeV as required from the muon $g-2$. Contrary to this expectation, we find that non-thermal leptogenesis with the right-handed neutrino masses of $\mathcal{O}(10^7)$GeV is possible. The successful scenario results in strict predictions on the neutrino oscillation parameters, which will be tested in future experiments.

arXiv comment62 pages, 11 figures, matching the version published in JHEP

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• Searching for Heavy Leptophilic $Z^{\prime }$: from Lepton Colliders to Gravitational Waves
• Thermal Leptogenesis in the Minimal Gauged $U(1{)}_{L_{\mu }-L_{\tau }}$ Model
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• Muon Beam Dump Experiments probe five-dimensional nature of $U(1{)}_{L_{\mu }-L_{\tau }}$