The effective neutrino charge radius
Abstract
It is shown that at oneloop order a neutrino charge radius (NCR) may be defined, which is ultraviolet finite, does not depend on the gaugefixing parameter, nor on properties of the target other than its electric charge. This is accomplished through the systematic decomposition of physical amplitudes into effective selfenergies, vertices, and boxes, which separately respect electroweak gauge invariance. In this way the NCR stems solely from an effective proper photonneutrino oneloop vertex, which satisfies a naive, QEDlike Ward identity. The NCR so defined may be extracted from experiment, at least in principle, by expressing a set of experimental electronneutrino crosssections in terms of the finite NCR and two additional gauge and renormalizationgroupinvariant quantities, corresponding to the electroweak effective charge and mixing angle. PACS: 13.15.+g Neutrino interactions  13.40.Gp Electromagnetic form factors
 Publication:

European Physical Journal C
 Pub Date:
 2004
 DOI:
 10.1140/epjcd/s2003039207
 arXiv:
 arXiv:hepph/0310028
 Bibcode:
 2004EPJC...33S.865P
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 Talk given at EPS2003  Aachen, Germany, July 2003