Lepton Numbers in the framework of Neutrino Mixing

Details Lepton Numbers in the framework of Neutrino Mixing Lepton Numbers in the framework of Neutrino Mixing

2001-02-27

arxiv.org/abs/hep-ph/0102320v1

Int.J.Mod.Phys. A16 (2001) 3931-3949

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages

Scientific paper

10.1142/S0217751X01004967

In this short review we discuss the notion of lepton numbers. The strong evidence in favor of neutrino oscillations obtained recently in the Super-Kamiokande atmospheric neutrino experiment and in solar neutrino experiments imply that the law of conservation of family lepton numbers L_e, L_mu and L_tau is strongly violated. We consider the states of flavor neutrinos nu_e, nu_mu and nu_tau and we discuss the evolution of these states in space and time in the case of non-conservation of family lepton numbers due to the mixing of light neutrinos. We discuss and compare different flavor neutrino discovery experiments. We stress that experiments on the search for nu_mu->nu_tau and nu_e->nu_tau oscillations demonstrated that the flavor neutrino nu_tau is a new type of neutrino, different from nu_e and nu_mu. In the case of neutrino mixing, the lepton number (only one) is connected with the nature of massive neutrinos. Such conserved lepton number exist if massive neutrinos are Dirac particles. We review possibilities to check in future experiments whether the conserved lepton number exists.

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