Probing the non-unitarity of the leptonic mixing matrix at the CEPC

TL;DR

This paper investigates the potential to detect non-unitarity in the leptonic mixing matrix, a sign of new physics related to neutrino masses, at the CEPC collider using the Minimal Unitarity Violation framework.

Contribution

It provides an analysis of current bounds and estimates the sensitivity of the CEPC to non-unitarity parameters within the MUV scheme.

Findings

Current bounds on non-unitarity parameters are summarized.

CEPC has significant potential to improve sensitivity to non-unitarity.

The study offers guidance for future experimental searches for new physics in neutrino sector.

Abstract

The non-unitarity of the leptonic mixing matrix is a generic signal of new physics aiming at the generation of the observed neutrino masses. We discuss the Minimal Unitarity Violation (MUV) scheme, an effective field theory framework which represents the class of extensions of the Standard Model (SM) by heavy neutral leptons, and discuss the present bounds on the non-unitarity parameters as well as estimates for the sensitivity of the Circular Electron Positron Collider (CEPC), based on the performance parameters from the preCDR.