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Clockwork for neutrino masses and lepton flavor violation

Ibarra, Alejandro and Kushwaha, Ashwani and Vempati, Sudhir K (2018) Clockwork for neutrino masses and lepton flavor violation. In: PHYSICS LETTERS B, 780 . pp. 86-92.

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Official URL: https://dx.doi.org/10.1016/j.physletb.2018.02.047

Abstract

We investigate the generation of small neutrino masses in a clockwork framework which includes Dirac mass terms as well as Majorana mass terms for the new fermions. We derive analytic formulas for the masses of the new particles and for their Yukawa couplings to the lepton doublets, in the scenario where the clockwork parameters are universal. When the universal Majorana mass vanishes, the zero mode of the clockwork sector forms a Dirac pair with the active neutrino, with a mass which is in agreement with oscillations experiments for a sufficiently large number of clockwork gears. On the other hand, when it does not vanish, neutrino masses are generated via the seesaw mechanism. In this case, and due to the fact that the effective Yukawa couplings of the higher modes can be sizable, neutrino masses can only be suppressed by postulating a large Majorana mass scale. Finally, we discuss the constraints on the mass scale of the clockwork fermions from the non-observation of the rare leptonic decay mu -> e gamma. (C) 2018 The Authors. Published by Elsevier B.V.

Item Type: Journal Article
Additional Information: Copyright of this article belong to ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Department/Centre: Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Depositing User: Id for Latest eprints
Date Deposited: 03 Jul 2018 15:32
Last Modified: 03 Jul 2018 15:32
URI: http://eprints.iisc.ac.in/id/eprint/60140

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