6533b858fe1ef96bd12b58a6
RESEARCH PRODUCT
Bounds on the tau and muon neutrino vector and axial vector charge radius
Martin S. HirschEnrico NardiDiego Restreposubject
PhysicsNuclear and High Energy PhysicsParticle physicsNeutral currentAstrophysics::High Energy Astrophysical PhenomenaEnergíaHigh Energy Physics::PhenomenologyFOS: Physical sciencesVectoresFísicaWeinberg angleRadioNuclear physicsMAJORANAHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)Charge radiusTau neutrinoCargasMuon neutrinoHigh Energy Physics::ExperimentHigh Energy PhysicsNeutrinoNeutrinosPseudovectordescription
A Majorana neutrino is characterized by just one flavor diagonal electromagnetic form factor: the anapole moment, that in the static limit corresponds to the axial vector charge radius . Experimental information on this quantity is scarce, especially in the case of the tau neutrino. We present a comprehensive analysis of the available data on the single photon production process $e^+ e^- -> \nu \bar\nu \gamma$ off Z-resonance, and we discuss the constraints that these measurements can set on for the tau neutrino. We also derive limits for the Dirac case, when the presence of a vector charge radius is allowed. Finally, we comment on additional experimental data on $\nu_\mu$ scattering from the NuTeV, E734, CCFR and CHARM-II collaborations, and estimate the limits implied for and for the muon neutrino.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2002-10-08 |