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Article Dans Une Revue Journal of High Energy Physics Année : 2020

Anomalies in $^8$Be nuclear transitions and $(g-2)_{e,\mu}$: towards a minimal combined explanation

Résumé

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 $^{8}$Be 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 $^{8}$Be 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)$_{e,μ}$ 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 $^{8}$Be particularly predictive. The underlying idea of this minimal “prototype model” can be readily incorporated into other protophobic U(1) extensions of the Standard Model.

Dates et versions

hal-02634694 , version 1 (27-05-2020)

Identifiants

Citer

C. Hati, J. Kriewald, J. Orloff, A.M. Teixeira. Anomalies in $^8$Be nuclear transitions and $(g-2)_{e,\mu}$: towards a minimal combined explanation. Journal of High Energy Physics, 2020, 07, pp.235. ⟨10.1007/JHEP07(2020)235⟩. ⟨hal-02634694⟩
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