The neutrino charge radius in the presence of fermion masses

Details The neutrino charge radius in the presence of fermion masses The neutrino charge radius in the presence of fermion masses

2004-05-28

arxiv.org/abs/hep-ph/0405288v1

Nucl.Phys. B716 (2005) 352-372

Physics

High Energy Physics

High Energy Physics - Phenomenology

26 pages, 8 figures

Scientific paper

10.1016/j.nuclphysb.2005.02.039

We show how the crucial gauge cancellations leading to a physical definition of the neutrino charge radius persist in the presence of non-vanishing fermion masses. An explicit one-loop calculation demonstrates that, as happens in the massless case, the pinch technique rearrangement of the Feynman amplitudes, together with the judicious exploitation of a fundamental current relation leads to a completely gauge independent definition of the effective neutrino charge radius. Using the formalism of the Nielsen identities it is further proved that the same cancellation mechanism operates unaltered to all orders in perturbation theory.

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