Searches for heavy neutrinos at multi-TeV muon collider : a resonant leptogenesis perspective

TL;DR

This paper explores the potential of a multi-TeV muon collider to detect heavy neutrinos through resonant leptogenesis, validating a neutrino mass model and analyzing collider signatures within experimental constraints.

Contribution

It introduces a (2,2) inverse see-saw model consistent with neutrino data and baryon asymmetry, and performs detailed collider analysis for heavy neutrino detection at muon colliders.

Findings

Validated model parameter space with neutrino oscillation data.

Identified parameter regions compatible with baryon asymmetry via resonant leptogenesis.

Performed collider simulations showing potential signals in $2l + \mET$ final states.

Abstract

In this work, the standard model (SM) is extended with two right-handed (RH) neutrinos and two singlet neutral fermions to yield active neutrino masses via (2,2) inverse see-saw mechanism. We first validate the multi-dimensional model parameter space with neutrino oscillation data, obeying the experimental bounds coming from the lepton flavor violating (LFV) decays: $\mu \to e \gamma,~ \tau \to e \gamma, ~ \tau \to \mu \gamma$. Besides we also search for the portion of the parameter space which yield the observed baryon asymmetry of the universe via resonant leptogenesis. Further, we pick up a few benchmark points from the aforementioned parameter space with TeV scale heavy neutrinos and perform an exhaustive collider analysis of the final states: $2l + \mET$ in multi-TeV muon collider.