Search for a leptophobic doubly charged Higgs in same-sign four-lepton and six-lepton signatures in a left-right symmetric model

TL;DR

This paper explores multi-lepton signatures, especially same-sign four-lepton and six-lepton signals, from doubly charged Higgs bosons in a left-right symmetric model, predicting observable signals at the HL-LHC with minimal background.

Contribution

It introduces a model with a doubly charged Higgs and extended scalars, predicting distinctive multi-lepton signatures with negligible background at the HL-LHC.

Findings

Potential to observe SS4L and six-lepton signals at HL-LHC for Higgs mass below 500 GeV.

Negligible background for these signatures enhances discovery prospects.

Model predicts specific multi-lepton signatures distinct from other new physics scenarios.

Abstract

We investigate the possibility of multi-lepton (four and six) signatures, including an exotic signature of same-sign four-lepton (SS4L) as signals of pair production of a doubly charged Higgs in the minimal left-right symmetric model, extended with two doublet scalars. The right-handed neutrino masses are generated in this model through a dimension-$5$ lepton-number violating operator allowing the triplet scalar interactions with leptons to become negligibly small. This leads to interesting six-lepton and SS4L signatures that can be observed at the high-luminosity phase of the Large Hadron Collider (HL-LHC) with almost no background for doubly charged Higgs with mass below 500 GeV.