Nuclear and Detector Sensitivities for Neutrinoless Double Beta-Decay Experiments

Hiroyasu Ejiri,Antonio J Accioly

doi:10.1155/2021/6666720

Abstract

Neutrinoless double beta-decay (DBD) is of current interest in high-sensitivity frontiers of particle physics. The decay is very sensitive to Majorana neutrino masses, neutrino CP phases, right-handed weak interactions, and others, which are beyond the standard electroweak model. DBDs are actually ultrarare events, and thus, DBD experiments with ultrahigh sensitivity are required. Critical discussions are presented on nuclear and detector sensitivities for high-sensitivity DBD experiments to study the neutrino masses in the normal and inverted mass hierarchies.

Highlights

Neutrinoless double beta-decay (DBD) is of current interest in sensitivity frontiers of particle physics
The decay violates the lepton number conservation law, and DBD is beyond the standard electroweak model
DBD is very sensitive to the Majorana nature of neutrino, the absolute neutrino mass scale and the neutrino mass hierarchy, the neutrino CP phases, the possible righthanded weak interactions, and others, which are beyond the standard model

Summary

Introduction

Neutrinoless double beta-decay (DBD) is of current interest in sensitivity frontiers of particle physics. Many experimental groups are working hard for highsensitivity DBD experiments to search for the small Majorana neutrino mass and others beyond the standard model. The DBD neutrino mass sensitivity to search for the small neutrino mass is defined as the minimum neutrino mass mm to be measured by the DBD experiment It is given by a product of a nuclear sensitivity and a detector sensitivity. The minimum neutrino mass to be measured and the nuclear and detector sensitivities are discussed in the review articles [1, 4, 7]. The present report is aimed at critically discussing the nuclear and detector sensitivities to search for the ultrarare DBD events associated with very small IH and NH masses. Critical discussions on DBD NMEs are presented elsewhere [8]

Neutrino Mass Sensitivity for DBD Experiment

DBD Nuclear and Detector Sensitivities

Remarks and Discussions on DBD Detectors