A new strategy for probing the Majorana neutrino CP violating phases and masses1

We propose a new strategy for detecting the CP‐violating phases and the effective mass of muon Majorana neutrinos by measuring observables associated with neutrino‐antineutrino oscillations in π± decays. Within the generic framework of quantum field theory, we compute the non‐factorizable probability for producing a pair of same‐charged muons in π± decays as a distinctive signature of νμ‐νμ oscillations. Using the neutrino‐antineutrino oscillation probability reported by MINOS collaboration, a new stringent bound on the effective muon‐neutrino mass is derived.