Neutrino magnetic moments in left-right symmetric models - art. no. 013010

A closer analysis of the neutrino magnetic moment is provided for various i nstances of the left-right (LR) symmetric model. We show that it is impossi ble to generate important Dirac neutrino magnetic moments because of model self-consistency problems. Majorana neutrinos are discussed in the frame of the most natural version of the LR model (with left- and right-handed trip lets and a bidoublet in the Higgs sector). We consider two limiting W-L - W -R mixing xi angles. in the case of a maximal value, the obtained transitio n magnetic moments could be interesting from an experimental point of view. On the other hand, a vanishing xi could make the Higgs particle contributi ons dominate the gauge boson ones. Thus we calculate gauge-Higgs and Higgs- Higgs diagrams, showing that, contrary to naive expectations, they are smal ler than those of the standard model.