Atomki anomaly in gauged $U(1{)}_R$ symmetric model

Abstract

The Atomki collaboration has reported that unexpected excesses have been observed in the rare decays of Beryllium nucleus. It is claimed that such excesses can suggest the existence of a new boson, called $X$, with the mass of about $17$ MeV. To solve the Atomki anomaly, we consider a model with gauged $U(1{)}_R$ symmetry and identify the new gauge boson with the $X$ boson. We also introduce two $SU(2)$ doublet Higgs bosons and one singlet Higgs boson, and discuss a very stringent constraint from neutrino-electron scattering. It is found that the $U(1{)}_R$ charges of the doublet scalars are determined to evade the constraint. In the end, we find the parameter region in which the Atomki signal and all experimental constraints can be simultaneously satisfied.

arXiv comment25 pages, 4 figures

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• Neutrino and dark matter in a gauged $U(1{)}_R$ symmetry
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• Tests of the Atomki anomaly in lepton pair decays of heavy mesons
• Dirac dark matter, dark radiation, and the type-II seesaw mechanism in alternative $U(1{)}_X$ standard model
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• Right handed neutrino production from $Z^{\prime }$ interactions in forward search experiments
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