The Neutrinoless Double Beta Decay in the Colored Zee-Babu Model

TL;DR

This paper investigates neutrinoless double beta decay within the colored Zee-Babu model, revealing potential cancellations between standard and new physics contributions, which could lead to hidden decay signals detectable through future isotope experiments.

Contribution

It introduces a detailed analysis of neutrinoless double beta decay in the colored Zee-Babu model, considering flavor constraints and new physics effects at two-loop level.

Findings

Standard light neutrino exchange can be canceled by new physics contributions.

Hidden neutrinoless double beta decay scenarios are possible under certain conditions.

Future isotope experiments can test the conditions for decay cancellation.

Abstract

We study the neutrinoless double beta decay in the colored Zee-Babu model. We consider three cases of the colored Zee-Babu model with a leptoquark and a diquark introduced. The neutrino masses are generated at two-loop level, and the constraints given by tree-level flavor violation processes and muon anomalous magnetic moment $(g-2)_{\mu}$ have been considered. In our numerical analysis, we find that the standard light neutrino exchange contribution can be canceled by new physics contribution under certain assumption and condition, leading to a hidden neutrinoless double beta decay. The condition can be examined comprehensively by future complementary searches with different isotopes.