PT Journal
AU Escrihuela, FJ
   Forero, DV
   Miranda, OG
   Tortola, M
   Valle, JWF
TI On the description of nonunitary neutrino mixing
SO Physical Review D
JI Phys. Rev. D
PY 2015
BP 053009
EP 16pp
VL 92
IS 5
DI 10.1103/PhysRevD.92.053009
LA English
AB Neutrino oscillations are well established and the relevant parameters determined with good precision, except for the CP phase, in terms of a unitary lepton mixing matrix. Seesaw extensions of the Standard Model predict unitarity deviations due to the admixture of heavy isosinglet neutrinos. We provide a complete description of the unitarity and universality deviations in the light-neutrino sector. Neutrino oscillation experiments involving electron or muon neutrinos and antineutrinos are fully described in terms of just three new real parameters and a new CP phase, in addition to the ones describing oscillations with unitary mixing. Using this formalism we describe the implications of nonunitarity for neutrino oscillations and summarize the model-independent constraints on heavy-neutrino couplings that arise from current experiments.
ER