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RESEARCH PRODUCT
The effective neutrino charge radius
J. VidalJoannis PapavassiliouDaniele BinosiJose Bernabeusubject
PhysicsCamps magnèticsCamps de galga (Física)Particle physicsPhysics and Astronomy (miscellaneous)Electroweak interactionHigh Energy Physics::PhenomenologyFOS: Physical sciencesElectric chargeEffective nuclear chargeVertex (geometry)High Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)AmplitudeCharge radiusGauge theoryNeutrinoEngineering (miscellaneous)description
It is shown that at one-loop order a neutrino charge radius (NCR) may be defined, which is ultraviolet finite, does not depend on the gauge-fixing parameter, nor on properties of the target other than its electric charge. This is accomplished through the systematic decomposition of physical amplitudes into effective self-energies, vertices, and boxes, which separately respect electroweak gauge invariance. In this way the NCR stems solely from an effective proper photon-neutrino one-loop vertex, which satisfies a naive, QED-like Ward identity. The NCR so defined may be extracted from experiment, at least in principle, by expressing a set of experimental electron-neutrino cross-sections in terms of the finite NCR and two additional gauge- and renormalization-group-invariant quantities, corresponding to the electroweak effective charge and mixing angle.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2003-10-02 |