Flavour in heavy neutrino searches at the LHC

TL;DR

This paper demonstrates that current LHC searches for heavy neutrinos, traditionally focused on electron and muon couplings, are also effective for tau couplings, thereby broadening the scope of neutrino flavor exploration.

Contribution

It reveals that existing LHC heavy neutrino searches are sensitive to tau couplings, expanding the understanding of flavor mixing constraints in left-right models.

Findings

Current limits extend to tau couplings of heavy neutrinos.

Significant constraints on flavor mixing parameters are established.

Search sensitivity surpasses previous assumptions for tau-related interactions.

Abstract

Heavy neutrinos at the TeV scale have been searched for at the LHC in the context of left-right models, under the assumption that they couple to the electron, the muon, or both. We show that current searches are also sensitive to heavy neutrinos coupling predominantly to the tau lepton, and present limits can significantly constrain the parameter space of general flavour mixing.