μ-τ interchange symmetry and lepton mixing

μ− τ Reflection Symmetry in Lepton Mixing and Neutrino Oscillations

We examine the possibility that the lepton mixing matrix may exhibit a strong form of μ − τ universality, in which corresponding elements of the μand τ neutrino flavour eigenstates have equal moduli, and find that it is consistent with present data on neutrino oscillations. We point out that in the Dirac case, this is equivalent to symmetry under μ−τ reflection, ie. the combined operation of μ ...

7 Analysis of Lepton Flavor Violating τ ± → μ ± μ ± μ ∓

Flavor Symmetry L e − L μ − L τ , Atmospheric Neutrino Mixing and CP Violation in the Lepton Sector

The PMNS neutrino mixing matrix is given, in general, by the product of two unitary matrices associated with the diagonalization of the charged lepton and neutrino mass matrices. Assuming that the active flavor neutrinos possess a Majorana mass matrix which is diagonalized by a bimaximal mixing matrix, we give the allowed forms of the charged lepton mixing matrix and the corresponding implied f...

Lepton Polarization in the Decays B → X s μ + μ − and B → X s τ + τ −

The effective Hamiltonian for the decay b → s l + l − predicts a characteristic polarization for the final state lepton, which can serve as an important test of the underlying theory. The lepton polarization has, in addition to a longitudinal component P L , two orthogonal components P T and P N , lying in and perpendicular to the decay plane which are proportional to m l /m b , and therefore s...

Probing lepton flavour violation in ν μ + N → τ + . . . scattering and μ → τ conversion on nucleons

We study lepton flavour-violating interactions which could result in the τ-lepton production in the ν µ N scattering or in µ → τ conversion on nucleons at high energies. Phenomenological bounds on the strength of ¯ τ ν µ ¯ qq ′ interactions are extracted from the combined result of the NOMAD and CHORUS experiments on searching for ν µ → ν τ oscillations. Some of these bounds supersede limits fr...