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Axino-Neutrino Mixing in Gauge-Mediated Supersymmetry Breaking Models
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Axino-Neutrino Mixing in Gauge-Mediated Supersymmetry Breaking Models
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When the strong CP problem is solved by spontaneous breaking of an anomalous global symmetry in theories with gauge-mediated supersymmetry breaking, the pseudo Goldstone fermion (the axino) is a good candidate of a light sterile neutrino. Its mixing with neutrinos relevant for current neutrino experiments can arise in the presence of R-parity violation. The realistic four neutrino mass matrix is obtained when the see-saw mechanism is brought in, and an ansatz for the right-handed neutrino mass is constructed.
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