A Majorana neutrino is characterized by just one flavor diagonal electromagnetic form factor: the anapole moment, that in the static limit corresponds to the axial vector charge radius . Experimental information on this quantity is scarce, especially in the case of the tau neutrino. We present a comprehensive analysis of the available data on the single photon production process $e^+ e^- -> \nu \bar\nu \gamma$ off Z-resonance, and we discuss the constraints that these measurements can set on for the tau neutrino. We also derive limits for the Dirac case, when the presence of a vector charge radius is allowed. Finally, we comment on additional experimental data on $\nu_\mu$ scattering from the NuTeV, E734, CCFR and CHARM-II collaborations, and estimate the limits implied for and for the muon neutrino.

/pdf/bounds-on-the-tau-and-muon-neutrino-vector-and-axial-vector-zrgek8v8sh.pdf

Bounds on the tau and muon neutrino vector and axial vector charge radius

https://pure.uva.nl/ws/files/4238117/1891_20708y.pdf

Search for anomalous production of single photons at $\sqrt{s}$ = 130 and 136 GeV

A study of single photon production in e+e− collisions at GeV with the TOPAZ detector at TRISTAN

New limits on the masses of the selectron and photino

/pdf/bounds-on-the-tau-and-muon-neutrino-vector-and-axial-vector-1ghwmor55p.pdf

A study of single photon production in e+ e− annihilation at s = 58 GeV

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A study of single photon production in e+ e− annihilation at s = 58 GeV