Gauged LL and different muon neutrino and anti-neutrino oscillations: MINOS and beyond
Résumé
If a Z gauge boson of a gauged L µ − L τ symmetry is very light, it is associated with a long-range leptonic force. In this case the particles in the Sun create via mixing of Z with the Standard Model Z a flavor-dependent potential for muon neutrinos in terrestrial long-baseline experiments. The potential changes sign for anti-neutrinos and hence can lead to apparent differences in neutrino and anti-neutrino oscillations without introducing CP or CPT violation. This can for instance explain the recently found discrepancy in the survival probabilities of muon neutrinos and anti-neutrinos in the MINOS experiment. We obtain the associated parameters of gauged L µ − L τ required to explain this anomaly, and compare our scenario to usually considered nonstandard interactions. When applied to MINOS, both approaches have difficulties with existing limits. The consequences for future long-baseline experiments and for the anomalous magnetic moment of the muon are discussed. The main feature is that atmospheric neutrino mixing has to be non-maximal in order to have an effect. Neutrino masses tend to have a mild hierarchy.
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PEER_stage2_10.1088%2F0954-3899%2F38%2F8%2F085005.pdf (269.74 Ko)
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