Abstract
We propose a new scenario of using the dark axion portal at one-loop level to explain the recently observed muon anomalous magnetic moment by the Fermilab Muon g-2 experiment. Both axion/axion-like particle (ALP) and dark photon are involved in the same vertex with photon. Although ALP or dark photon alone cannot explain muon g-2, since the former provides only negative contribution while the latter has very much constrained parameter space, dark axion portal can save the situation and significantly extend the allowed parameter space. The observed muon anomalous magnetic moment provides a robust probe of the dark axion portal scenario.
Highlights
The muon anomalous magnetic moment aμ ≡/2, where gμ is the muon g-factor, is one of the most precisely measured physical parameters in the Standard Model (SM) of particle physics [1,2,3]
We explore the possibility that the dark axion portal [56] with coupling among axion-like particle (ALP) a, photon γ, and a massive dark photon γ can explain the observed muon anomalous magnetic moment at the Fermilab Muon g-2 experiment
The latest measurement of the muon anomalous magnetic moment at the Fermilab Muon g-2 experiment further enhances the discrepancy with theoretical prediction from 3.7 σ to 4.2 σ
Summary
The muon anomalous magnetic moment aμ ≡ (gμ − 2)/2, where gμ is the muon g-factor, is one of the most precisely measured physical parameters in the Standard Model (SM) of particle physics [1,2,3]. The longstanding discrepancy [2,19] between theoretical predictions [20,21] and experimental results is observed by the new measurement (2) at Fermilab with 4.2 σ significance (combined with BNL E821), aμ ≡ aμexp − aμSM = 251 (59) × 10−11. We explore the possibility that the dark axion portal [56] with coupling among ALP a, photon γ , and a massive dark photon γ can explain the observed muon anomalous magnetic moment at the Fermilab Muon g-2 experiment. Since this dimension-5 operator was proposed only recently
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