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- W3213998118 abstract "A bstract We provide a novel explanation to the muon g − 2 excess with new physics contributions at the two-loop level. In this scenario, light millicharged particles are introduced to modify the photon vacuum polarization that contributes to muon g − 2 at one additional loop. The muon g − 2 excess can be explained with the millicharged particle mass m χ around 10 MeV and the product of the multiplicity factor and millicharge squared of N χ ε 2 ∼ 10 − 3 . The minimal model faces severe constraints from direct searches at fixed-target experiments and astrophysical observables. However, if the millicharged particles are also charged under a hidden confining gauge group SU( N χ ) with a confinement scale of MeV, hidden-sector hadrons are unstable and can decay into neutrinos, which makes this scenario consistent with existing constraints. This explanation can be well tested at low-energy lepton colliders such as BESIII and Belle II as well as other proposed fixed-target experiments." @default.
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- W3213998118 date "2021-11-01" @default.
- W3213998118 modified "2023-10-06" @default.
- W3213998118 title "Muon g − 2 from millicharged hidden confining sector" @default.
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- W3213998118 doi "https://doi.org/10.1007/jhep11(2021)019" @default.
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