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

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

2002-10-09

arxiv.org/abs/hep-ph/0210137v2

Phys.Rev.D67:033005,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 2 eps figures. CCFR data included in the analysis. Conclusion unchanged

Scientific paper

10.1103/PhysRevD.67.033005

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.

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