Linear Collider Test of a Neutrinoless Double Beta Decay Mechanism in left-right Symmetric Theories

TL;DR

This paper explores how a linear collider can test neutrinoless double beta decay mechanisms in left-right symmetric theories, focusing on the lambda-diagram and its observable signatures near current experimental limits.

Contribution

It identifies the lambda-diagram as the most promising test at linear colliders and evaluates the relevant cross section considering current experimental constraints.

Findings

The lambda-diagram can be tested at linear colliders if parameters are near current limits.

Beam polarization enhances the detection prospects.

High-energy behavior of the cross section supports observability.

Abstract

There are various diagrams leading to neutrinoless double beta decay in left-right symmetric theories based on the gauge group SU(2)_L x SU(2)_R. All can in principle be tested at a linear collider running in electron-electron mode. We argue that the so-called lambda-diagram is the most promising one. Taking the current limit on this diagram from double beta decay experiments, we evaluate the relevant cross section e e to W_L W_R, where W_L is the Standard Model W-boson and W_R the one from SU(2)_R. It is observable if the life-time of double beta decay and the mass of the W_R are close to current limits. Beam polarization effects and the high-energy behaviour of the cross section are also analyzed.