Collider Phenomenology of $e^{-}e^{-}\to W^{-}W^{-}$

TL;DR

This paper explores the potential of future electron-electron colliders to detect Majorana neutrinos through the process $e^{-}e^{-} o W^- W^-$, offering a complementary approach to neutrinoless double-beta decay experiments.

Contribution

It proposes and analyzes search strategies for the process $e^{-}e^{-} o W^- W^-$ at future colliders, highlighting the most promising channels for discovery.

Findings

Pure hadronic, semi-leptonic with muon, and pure leptonic with muon channels have high discovery potential.

Future electron colliders can effectively probe Majorana neutrinos via inverse neutrinoless double-beta decay.

The study provides detailed search strategies for these collider processes.

Abstract

Whether in nature exists Majorana neutrino is one of the most fundamental questions in physics. It is directly related to the violation of accidental $U(1)$-lepton number symmetry(LNV). Enormous efforts had been put into such test and among them, one conventional experiment is the neutrinoless double-beta decay ($0\nu\beta\beta$). On the other hand, there have been proposals of future electron-positron colliders such as International Linear Collider (ILC) for precision measurements of Higgs boson or new discovered beyond SM particles and it can potentially be converted into an electron-electron collider. Such collider enables a new probe of Majorana neutrino via the inverse $0\nu\beta\beta$ process($e^{-}e^{-}\to W^- W^-$) as an alternative and complementary test to the conventional neutrinoless double-beta decay experiments. In this paper, we illustrate the searching strategies of $e^{-}e^{-}\to W^- W^-$ at future electron colliders, and find that the channels of pure hadronic, semi-leptonic with muon and pure leptonic with muons have the most discovery potential.