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The effective neutrino charge radius
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| Papavassiliou, Joannis; Bernabeu Alberola, José; Binosi, Daniele; Vidal Perona, Jorge | |||
| Aquest document és un/a article, creat/da en: 2004 | |||
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Este documento está disponible también en : 10.1140/epjcd/s2003-03-920-7 |
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| 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. | |||
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22 - Física [3766]