–2–

JHEP05(2021)232

where the deviation from the SM prediction is ∼ 3σ level with a positive value; recent
theoretical analysis further indicates 3.7σ deviation [32] and other analysis is also found
in refs. [33–36]. Moreover, several upcoming experiments such as Fermilab E989 [37] and
J-PARC E34 [38] will give the results with more precision. Although the recent result
on the hadron vacuum polarization (HVP), calculated by Budapest- Marseille-Wuppertal
(BMW) collaboration [40], weakens the necessity of a new physics effect, it is shown in
refs. [41, 42]1 that the BMW result indicates new tensions with the HVP extracted from
e+ e− data and the global fits to the electroweak precision observables. If the anomaly is
confirmed, the muon g − 2 is a clear signal of a new physics effects; various solutions have
been proposed to explain the anomaly such as scenarios shown in refs. [45–70]. One of the
attractive solution is given in general THDM where lepton flavour violating interactions
provide sizable contribution.

### Language ###
English

### Assessment ###
We can ask about how significant the deviation from Standard Model predictions is for the muon g-2 anomaly.

### Query ###
What is the statistical significance of the muon g-2 anomaly?
What is the statistical significance of the muon g-2 anomaly?