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New physics behind the new muon g-2 puzzle?

2022; Elsevier BV; Volume: 829; Linguagem: Inglês

10.1016/j.physletb.2022.137037

1873-2445

Luca Di Luzio, A. Masiero, Paride Paradisi, M. Passera,

High-Energy Particle Collisions Research

The recent measurement of the muon $g$-2 at Fermilab confirms the previous Brookhaven result. The leading hadronic vacuum polarization (HVP) contribution to the muon $g$-2 represents a crucial ingredient to establish if the Standard Model prediction differs from the experimental value. A recent lattice QCD result by the BMW collaboration shows a tension with the low-energy $e^+e^- \to \text{hadrons}$ data which are currently used to determine the HVP contribution. We refer to this tension as the new muon $g$-2 puzzle. In this Letter we consider the possibility that new physics contributes to the $e^+e^- \to \text{hadrons}$ cross-section. This scenario could, in principle, solve the new muon $g$-2 puzzle. However, we show that this solution is excluded by a number of experimental constraints.