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- W2465808511 abstract "Viability of the μ-τ interchange symmetry imposed as an approximate symmetry (1) on the neutrino mass matrix $ {{mathcal{M}}_{vf }} $ in the flavour basis (2) simultaneously on the charged lepton mass matrix M l and the neutrino mass matrix M ν and (3) on the underlying Lagrangian is discussed in the light of recent observation of a non-zero reactor mixing angle θ 13. In case (1), μ-τ symmetry breaking may be regarded as small (less than 20-30%) only for the inverted or quasidegenerate neutrino mass spectrum and the normal hierarchy would violate it by a large amount. The case (2) is more restrictive and the requirement of relatively small breaking allows only the quasidegenerate spectrum. If neutrinos obtain their masses from the type-I seesaw mechanism then small breaking of the μ-τ symmetry in the underlying Lagrangian may result in a large breaking in $ {{mathcal{M}}_{vf }} $ and even the hierarchical neutrino spectrum may also be consistent with mildly broken μ-τ symmetry of the Lagrangian. Neutrinoless double beta decay provides a good means of distinguishing above scenarios. In particular, non-observation of signal in future experiments such as GERDA would rule out scenarios (1) and (2)." @default.
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- W2465808511 date "2013-09-01" @default.
- W2465808511 modified "2023-10-16" @default.
- W2465808511 title "How good is μ-τ symmetry after results on non-zero θ 13?" @default.
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- W2465808511 doi "https://doi.org/10.1007/jhep09(2013)035" @default.
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