Etkin, Altay; Deppisch, Frank; (2022) Multiple short-range contributions to the 0νββ decay process for probing beyond the Standard Model. UCL Department of Physics and Astronomy: London, UK.

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Abstract

Neutrinoless double beta decay is a crucial test for lepton number violation in particle physics. Observation of this process would have fundamental implications for neutrino physics, theories beyond the Standard Model and cosmology. Within this mindset, using the IBM-2 framework and previously achieved constraints between single short-ranged contributions at a time as well as between standard light neutrino mass and with one short-range contribution leading to interference among them, we extend the work to multi-contributions without assuming any form of restriction on the parameter space. It is shown that such contributions are achieved upon constructing effective normalised couplings written in a 3×3 symmetric and real matrix, for which bounds on the quadratic form defined by the neutrinoless double-beta decay inverse half-life formula, leads to ellipsoid constraints on these effective parameters.

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