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

Abstract

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 <r^2_A>. 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 <r^2_A> for the tau neutrino. We also derive limits for the Dirac case, when the presence of a vector charge radius <r^2_V> 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 <r^2_A> and <r^2_V> for the muon neutrino.

arXiv comment20 pages, 2 eps figures. CCFR data included in the analysis. Conclusion unchanged

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