New Parity-Violating Muonic Forces and the Proton Charge Radius
2011; American Physical Society; Volume: 107; Issue: 1 Linguagem: Inglês
10.1103/physrevlett.107.011803
ISSN1092-0145
AutoresBrian Batell, David McKeen, Maxim Pospelov,
Tópico(s)Neutrino Physics Research
ResumoThe recent discrepancy between proton charge radius measurements extracted from electron-proton versus muon-proton systems is suggestive of a new force that differentiates between lepton species. We identify a class of models with gauged right-handed muon number, which contains new vector and scalar force carriers at the ∼100 MeV scale or lighter, that is consistent with observations. Such forces would lead to an enhancement by several orders-of-magnitude of the parity-violating asymmetries in the scattering of low-energy muons on nuclei. The relatively large size of such asymmetries, O(10(-4)), opens up the possibility for new tests of parity violation in neutral currents with existing low-energy muon beams.
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