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The constraints on the number of neutrinos generations, ′ g 1 coupling and ′ Z Z − mixing angle through the invisible width method, and in the framework of a − − − − × ≤ ≤ × θ , improving the existing bounds by one order of magnitude. Keywords Ordinary Neutrinos, Neutral Currents, Models beyond the Standard Modeldoi:10.4236/jmp.2015.68112 fatcat:xet7an7h5jaglhvwkzb6cfitpq