6533b820fe1ef96bd1279175
RESEARCH PRODUCT
New ambiguity in probing CP violation in neutrino oscillations
Mariam TórtolaO. G. MirandaJosé W. F. Vallesubject
Particle physicsPhysics::Instrumentation and DetectorsPhysics beyond the Standard ModelAstrophysics::High Energy Astrophysical PhenomenaGeneral Physics and AstronomyFOS: Physical sciences01 natural sciencesPartícules (Física nuclear)High Energy Physics - ExperimentMatrix (mathematics)High Energy Physics - Experiment (hep-ex)High Energy Physics - Phenomenology (hep-ph)Violació CP (Física nuclear)0103 physical sciences010306 general physicsNeutrino oscillationMixing (physics)Physics010308 nuclear & particles physicsOscillationHigh Energy Physics::PhenomenologyHigh Energy Physics - PhenomenologySeesaw mechanismCP violationHigh Energy Physics::ExperimentNeutrinodescription
If neutrinos get mass via the seesaw mechanism the mixing matrix describing neutrino oscillations can be effectively non-unitary. We show that in this case the neutrino appearance probabilities involve a new CP phase, phi, associated to non-unitarity. This leads to an ambiguity in extracting the "standard" three--neutrino phase delta_CP, which can survive even after neutrino and antineutrino channels are combined. Its existence should be taken into account in the planning of any oscillation experiment aiming at a robust measurement of delta_CP.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-04-19 |