Multilepton Signatures of the Higgs Boson through its Production in Association with a Top-quark Pair

TL;DR

This paper investigates the detection of Higgs boson produced with a top-quark pair at the LHC, focusing on signatures with minimal background, especially the '3 electron/muon + tau jet + bottom jet' signature, which could be observable soon.

Contribution

It identifies promising Higgs boson signatures in association with top quarks, emphasizing the potential of specific multi-lepton and jet signatures for early detection at the LHC.

Findings

'3 electron/muon + tau jet + bottom jet' signature is promising for Higgs detection.

Some signatures could be observed within a year at the LHC.

Other signatures require higher luminosity for detection.

Abstract

We consider the possible production of the Higgs Boson in association with a top-quark pair and its subsequent decay into a tau-lepton pair or a W-boson pair. This process can give rise to many signatures of the Higgs boson. These signatures can have electrons, muons, tau jets, bottom jets and/or light flavour jets. We analyze the viability of some of these signatures. We will look at those signatures where the background is minimal. In particular, we explore the viability of the signatures "isolated 4 electron/muon" and "isolated 3 electron/muon + a jet" The jet can be due to a light flavour quark/gluon, a bottom quark, or a tau lepton. Of all these signatures, we find that "isolated 3 electron/muon + a tau jet", with an extra bottom jet, can be an excellent signature of this mode of the Higgs boson production. We show that this signature may be visible within a year, once the Large Hadron Collider (LHC) restarts. Some of the other signatures would also be observable after the LHC accumulates sufficient luminosity.