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- W3175136731 abstract "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 $m_chi$ around 10 MeV and the product of the multiplicity factor and millicharge squared of $N_chi varepsilon^2 sim 10^{-3}$. 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 $SU(N_chi)$ 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.
- W3175136731 created "2021-07-05" @default.
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- W3175136731 date "2021-06-29" @default.
- W3175136731 modified "2023-09-27" @default.
- W3175136731 title "Muon g-2 from Millicharged Hidden Confining Sector" @default.
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- W3175136731 hasPublicationYear "2021" @default.
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