Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 7, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP07(2020)235
Keywords
Beyond Standard Model; Neutrino Physics
Categories
Funding
- DFG Emmy Noether Grant [HA 8555/1-1]
- European Union [690575, 674896]
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Motivated by a simultaneous explanation of the apparent discrepancies in the light charged lepton anomalous magnetic dipole moments, and the anomalous internal pair creation in Be-8 nuclear transitions, we explore a simple New Physics model, based on an extension of the Standard Model gauge group by a U(1)(B-L). The model further includes heavy vector-like fermion fields, as well as an extra scalar responsible for the low-scale breaking of U(1)(B-L), which gives rise to a light Z ' boson. The new fields and currents allow to explain the anomalous internal pair creation in Be-8 while being consistent with various experimental constraints. Interestingly, we find that the contributions of the Z ' and the new U(1)(B-L)-breaking scalar can also successfully account for both (g -2)(e,mu) anomalies; the strong phenomenological constraints on the model's parameter space ultimately render the combined explanation of (g - 2)(e) and the anomalous internal pair creation in Be-8 particularly predictive. The underlying idea of this minimal prototype model can be readily incorporated into other protophobic U(1) extensions of the Standard Model.
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