Neutrinoless double beta decays of the top quark and other effects of heavy Majorana neutrinos

TL;DR

This paper explores the rare neutrinoless double beta decay of the top quark mediated by heavy Majorana neutrinos, predicting measurable rates at the LHC and novel lepton number violating processes involving charged Higgs bosons.

Contribution

It introduces the possibility of observing top quark neutrinoless double beta decay and related lepton number violating events mediated by heavy Majorana neutrinos and charged Higgs interactions.

Findings

Predicted measurable decay rates at the LHC with 100 fb^-1 luminosity.

Identified lepton number violating processes such as pp to l+ l+ H-.

Proposed new signatures for heavy Majorana neutrinos in top quark decays.

Abstract

We discuss the rare decay of the top quark into a pair of same charge leptons (with identical or different flavors), a b quark and a (real or virtual) W-. The above process proceeds only if the exchanged neutrino N is of the Majorana type. This decay is the neutrinoless double b decay of the top. We find measurable values for its rate at the LHC with luminosity of 100 inverse fb. Furthermore, we consider an interaction of charged Higgs bosons with N which leads to lepton number violating processes such as pp to l+ N to l+ l+ H-, exhibiting spectacular events of the type: l+ l+ b b(bar) + 2 jets.