Leptoquark-assisted Singlet-mediated Di-Higgs Production at the LHC

TL;DR

This paper explores how a new singlet scalar, produced via leptoquark loops, can enhance di-Higgs production at the LHC, showing promising detection prospects at the HL-LHC in specific decay modes.

Contribution

It introduces a novel mechanism for di-Higgs production mediated by a singlet scalar involving leptoquark loops, with detailed analysis of detection prospects at the HL-LHC.

Findings

Significant parameter space accessible at HL-LHC

Potential for 5σ discovery in the $bar{b} au^{+} au^{-}$ mode

Enhanced di-Higgs production via leptoquark-mediated singlet scalar

Abstract

At the LHC, the gluon-initiated processes are considered to be the primary source of di-Higgs production. However, in the presence of a new resonance, the light-quark initiated processes can also contribute significantly. In this paper, we look at the di-Higgs production mediated by a new singlet scalar. The singlet is produced in both quark-antiquark and gluon fusion processes through loops involving a scalar leptoquark and right-handed neutrinos. With benchmark parameters inspired from the recent resonant di-Higgs searches by the ATLAS collaboration, we examine the prospects of such a resonance in the TeV-range at the High-Luminosity LHC (HL-LHC) in the $b\bar{b} \tau^{+}\tau^{-}$ mode with a multivariate analysis. We obtain the $5\sigma$ and $2\sigma$ contours and find that a significant part of the parameter space is within the reach of the HL-LHC.