TeV-scale left-right symmetry and large mixing effects in neutrinoless double beta decay

Bhupal Dev, P. S. ; Goswami, Srubabati ; Mitra, Manimala (2015) TeV-scale left-right symmetry and large mixing effects in neutrinoless double beta decay Physical Review D: Particles, Fields, Gravitation, and Cosmology, 91 (11). Article ID 113004. ISSN 2470-0010

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Official URL: https://journals.aps.org/prd/abstract/10.1103/Phys...

Related URL: http://dx.doi.org/10.1103/PhysRevD.91.113004


We revisit various contributions to neutrinoless double beta decay (0νββ) in a TeV-scale Left-right Symmetric Model (LRSM) for type-I seesaw dominance. We show that the momentum-dependent effects due to WL−WR exchange (λ diagram) and WL−WR mixing (η diagram) could give dominant contributions to the 0νββ amplitude in a wide range of the LRSM parameter space with large left-right neutrino mixing. In particular for a relatively large WL−WR mixing, the η contribution by itself could saturate the current experimental limit on the 0νββ half-life, thereby providing stringent constraints on the relevant LRSM parameters, complementary to the indirect constraints derived from lepton-flavor-violating observables. In a simplified scenario parametrized by a single light-heavy neutrino mixing, the inclusion of the λ and η contributions leads to significantly improved 0νββ constraints on the light-heavy neutrino mixing as well as on the WL−WR mixing parameters. We also present a concrete TeV-scale LRSM setup, where the mixing effects are manifestly enhanced and discuss the interplay between 0νββ, lepton flavor violation and electric dipole moment constraints.

Item Type:Article
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ID Code:108853
Deposited On:01 Feb 2018 04:48
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