Speaker
Description
We explore a left-right symmetric model utilizing a double seesaw mechanism to generate Majorana masses for both light and heavy neutrinos, which facilitates significant lepton number violation, including contributions to neutrinoless double beta decay. The Higgs sector in this model includes two Higgs doublets, $H_L$, and $H_R$, while the fermion sector consists of the usual quarks and leptons, along with an $SU(2)$ singlet fermion $S_L$. A bare Majorana mass term for this sterile neutrino induces a large Majorana mass for the heavy right-handed neutrinos, leading to substantial new contributions to neutrinoless double beta decay. Detailed analysis of these contributions reveals that the normal hierarchy for light neutrinos is more likely to be detectable, especially if evidence of $0\nu\beta\beta$ decay is observed and cosmological constraints on $\Sigma m_i$ are considered.
| Field of contribution | Phenomenology |
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