The effective neutrino charge radius
Abstract
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.
Cite
@article{arxiv.hep-ph/0310028,
title = {The effective neutrino charge radius},
author = {J. Papavassiliou and J. Bernabeu and D. Binosi and J. Vidal},
journal= {arXiv preprint arXiv:hep-ph/0310028},
year = {2011}
}
Comments
Talk given at EPS2003 - Aachen, Germany, July 2003; 3 pages, no figures