Search for heavy Majorana neutrinos at future lepton colliders

TL;DR

This paper explores the potential to detect heavy Majorana neutrinos and associated CP violation effects in W boson processes at future lepton colliders, providing insights into physics beyond the standard model.

Contribution

It analyzes CP violation effects and signals of heavy Majorana neutrinos in W boson pair production and rare decays at future lepton colliders, focusing on neutrino masses between 15 and 70 GeV.

Findings

Potential signals of heavy Majorana neutrinos in collider experiments.

CP violation effects can be observed in W boson rare decays.

Enhanced sensitivity to neutrino properties at future colliders.

Abstract

The nonzero neutrino mass can be a signal for new physics beyond the standard model. To explain the tiny neutrino mass, we can extend the standard model with right-handed Majorana neutrinos in a low-scale seesaw mechanism, while the CP violation effect can be induced due to the CP phase in the interference of heavy Majorana neutrinos. The existence of heavy Majorana neutrinos may lead to lepton number violation processes, which can be used as a probe to search for the signal of heavy Majorana neutrinos. In this paper, we focus on the CP violation effect related to two generations of heavy Majorana neutrinos for $15$ GeV $<m_N<$ $70$ GeV in the pair production of W bosons and rare decays. It is valuable to investigate the Majorana neutrino production signals and the related CP violation effects in the W boson rare decays at future lepton colliders.