Higgs Decays to Unstable Neutrinos: Collider Constraints from Inclusive Like-Sign Dilepton Searches

TL;DR

This paper investigates how Higgs decays into unstable fourth-generation neutrinos can produce like-sign dilepton events, using collider data to constrain the properties of these hypothetical particles.

Contribution

It introduces a novel analysis of Higgs decay channels into fourth-generation neutrinos and uses collider data to set bounds on their properties.

Findings

Collider data constrains fourth-generation neutrino parameters.

Higgs decay into neutrinos can produce detectable like-sign dileptons.

Parameter space for fourth-generation leptons is significantly limited.

Abstract

We study the pair production of fourth generation neutrinos from the decay of an on-shell Higgs produced by gluon fusion. In a fourth generation scenario, the Higgs branching fraction into fourth generation neutrinos may be quite large. In the case that the unstable heavy neutrinos are a mixed Majorana and Dirac state, neutrinos pair-produced from Higgs decay will yield a substantial number of like-sign dilepton events. In this article we use inclusive like-sign dilepton searches from hadron colliders to constrain the theoretical parameter space of fourth generation leptons.