2018 Impact factor 4.843
Particles and Fields
Eur. Phys. J. C16, 453-460
DOI 10.1007/s100520000422

Trimuon production in $\nu$N-scattering as a probe of massive neutrinos

M. Flanz1 - W. Rodejohann1 - K. Zuber2

1 Lehrstuhl für Theoretische Physik III, Universität Dortmund, Otto-Hahn Strasse 4, 44221 Dortmund, Germany
2 Lehrstuhl für Experimentelle Physik IV, Universität Dortmund, Otto-Hahn Strasse 4, 44221 Dortmund, Germany

Received: 16 February 2000 / Revised version: 11 April 2000 / Published online: 6 July 2000 - © Springer-Verlag 2000

Abstract
The lepton-number violating process $\mbox{$\nu_\mu$ }N \rightarrow\mu^- \mu^+ \mu^+ X$ is studied for the first time in connection with Majorana neutrino masses of the second generation. The sensitivity for light and heavy Majorana neutrinos is investigated. The ratio with respect to the standard model charged current process is improved by some orders of magnitude if compared to previously discussed Majorana induced $\Delta L_{\mu} = 2$ processes. Non-observation of this process in previous experiments allows to demand the effective mass to be $\langle m_{\mu \mu} \rangle
\lesssim
10^{4}$GeV, being more stringent than previously discussed direct bounds, however still unnaturally high. Therefore, in the forseeable future, indirect bounds on effective masses other than $\langle m_{ee} \rangle$


Copyright Società Italiana di Fisica, Springer-Verlag 2000