Gauging U(1) symmetries and the number of right-handed neutrinos

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2009-05-04

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Elsevier B.V.

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In this Letter we consider that assuming: (a) that the only left-handed neutral fermions are the active neutrinos, (b) that B - L is a gauge symmetry, and (c) that the L assignment is restricted to the integer numbers, the anomaly cancellation imply that at least three right-handed neutrinos must be added to the minimal representation content of the electroweak standard model. However, two types of models arise: (i) the usual one where each of the three identical right-handed neutrinos has total lepton number L = 1: (ii) and the other one in which two of them carry L = 4 while the third one carries L = -5. (C) 2009 Elsevier B.V. All rights reserved.

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Physics Letters B. Amsterdam: Elsevier B.V., v. 675, n. 1, p. 64-68, 2009.

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