THE NUMBER OF NEUTRINOS AND THE LEFT-RIGHT-SYMMETRICAL MODEL

The meaning of N-v in the Left-Right Symmetric Model (LRSM) is discuss ed. In its original definition N-v, is the number of neutrinos or gene rations of leptons, so, in the Standard Model its value is three. Howe ver the determination of N-v in experiments and in astrophysical obser vations is subject to different theoretical interpretations. We presen t arguments that gives N-v as a parameter of the LRSM. Using an experi mental value for the rate Gamma(inv)/Gamma(l tau) we calculate the bou nd 2.90 less than or equal to N-vLR less than or equal to 3.04 (90% C. L.), where N-vLR is a function of the left-right mixing angle phi. Th is range is less restrictive than the one of the standard model.