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Bulk Majorana mass terms and Dirac neutrinos in the Randall-Sundrum model

Iyer, Abhishek M and Vempati, Sudhir K (2013) Bulk Majorana mass terms and Dirac neutrinos in the Randall-Sundrum model. In: PHYSICAL REVIEW D, 88 (7).

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Official URL: http://dx.doi.org/10.1103/PhysRevD.88.073005


We present a novel scheme where Dirac neutrinos are realized even if lepton number violating Majorana mass terms are present. The setup is the Randall-Sundrum framework with bulk right-handed neutrinos. Bulk mass terms of both Majorana and Dirac type are considered. It is shown that massless zero mode solutions exist when the bulk Dirac mass term is set to zero. In this limit, it is found that the effective 4D small neutrino mass is primarily of Dirac nature, with the Majorana-type contributions being negligible. Interestingly, this scenario is very similar to the one known with flat extra dimensions. Neutrino phenomenology is discussed by fitting both charged lepton masses and neutrino masses simultaneously. A single Higgs localized on the IR brane is highly constrained, as unnaturally large Yukawa couplings are required to fit charged lepton masses. A simple extension with two Higgs doublets is presented, which facilitates a proper fit for the lepton masses.

Item Type: Journal Article
Additional Information: copyright for this article belongs to AMER PHYSICAL SOC
Department/Centre: Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited: 30 Nov 2013 13:21
Last Modified: 30 Nov 2013 13:22
URI: http://eprints.iisc.ac.in/id/eprint/47845

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