On neutrinoless double beta decay in the minimal left–right symmetric model

Wei-Chih Huang (Department of Physics and Astronomy, University College London, WC1E 6BT, London, UK; INFN, sezione di Trieste, 34136Â , Trieste, Italy; SISSA, via Bonomea 265, 34136Â , Trieste, Italy) ; J. Lopez-Pavon (INFN, sezione di Trieste, 34136Â , Trieste, Italy; SISSA, via Bonomea 265, 34136Â , Trieste, Italy)

We analyze the general phenomenology of neutrinoless double beta decay in the minimal left–right symmetric model. We study under which conditions a New Physics dominated neutrinoless double beta decay signal can be expected in the future experiments. We show that the correlation among the different contributions to the process, which arises from the neutrino mass generation mechanism, can play a crucial role. We have found that, if no fine tuned cancelation is involved in the light–active neutrino contribution, a New Physics signal can be expected mainly from the WR – WR channel. An interesting exception is the WL – WR channel which can give a dominant contribution to the process if the right-handed neutrino spectrum is hierarchical with M1≲  MeV and M2,M3≳  GeV. We also discuss if a New Physics signal in neutrinoless double beta decay experiments is compatible with the existence of a successful Dark Matter candidate in the left–right symmetric models. It turns out that, although it is not a generic feature of the theory, it is still possible to accommodate such a signal with a KeV sterile neutrino as dark matter.

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      "title": "On neutrinoless double beta decay in the minimal left\u2013right symmetric model"
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      "value": "We analyze the general phenomenology of neutrinoless double beta decay in the minimal left\u00e2\u0080\u0093right symmetric model. We study under which conditions a New Physics dominated neutrinoless double beta decay signal can be expected in the future experiments. We show that the correlation among the different contributions to the process, which arises from the neutrino mass generation mechanism, can play a crucial role. We have found that, if no fine tuned cancelation is involved in the light\u00e2\u0080\u0093active neutrino contribution, a New Physics signal can be expected mainly from the WR \u00e2\u0080\u0093 WR channel. An interesting exception is the WL \u00e2\u0080\u0093 WR channel which can give a dominant contribution to the process if the right-handed neutrino spectrum is hierarchical with M1\u00e2\u0089\u00b2 \u00c2 MeV and M2,M3\u00e2\u0089\u00b3 \u00c2 GeV. We also discuss if a New Physics signal in neutrinoless double beta decay experiments is compatible with the existence of a successful Dark Matter candidate in the left\u00e2\u0080\u0093right symmetric models. It turns out that, although it is not a generic feature of the theory, it is still possible to accommodate such a signal with a KeV sterile neutrino as dark matter."
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Published on:
06 May 2014
Publisher:
Springer/Società Italiana di Fisica
Published in:
European Physical Journal C (2014)
Issue 5
DOI:
https://doi.org/10.1140/epjc/s10052-014-2853-z
Copyrights:
The Author(s)
Licence:
CC-BY-3.0

Fulltext files: