Enhanced Higgs pair production from higgsino decay at the HL-LHC

TL;DR

This paper investigates the potential to detect Higgs pair production from higgsino decays at the HL-LHC, showing that certain decay channels could provide observable signals exceeding Standard Model predictions.

Contribution

It introduces a detailed analysis of Higgs pair plus missing energy signals from light higgsino decays, highlighting the $bbbb+ ext{E}_T$ channel as promising for HL-LHC detection.

Findings

The $bbbb+ ext{E}_T$ channel can reach 2σ significance at HL-LHC.

Higgs pair signals from higgsino decay can surpass SM predictions.

The study provides Monte Carlo simulations for signal and background analysis.

Abstract

The scenario of multi-sector SUSY breaking predicts pseudo-goldstinos which are not absorbed by the gravitino and their mass can be as low as ${{\cal O} (0.1)}$ GeV. Since the interactions of pseudo-goldstinos are not so weak as gravitino, a produced higgsino can decay to a pseudo-goldstino plus a Higgs boson insider the detector at the LHC, and thus the higgsino pair production can lead to the signal of Higgs pair plus missing energy. For the scenario of natural SUSY which requires rather light higgsinos, such events may sizably outnumber the Higgs pair events predicted by the SM and be accessible at the HL-LHC (14 TeV with a luminosity of 3~$\rm{ab}^{-1}$). In this work we examine the observability of such Higgs pair plus missing energy from the decay of light higgsinos produced at the HL-LHC. Considering three channels of the Higgs-pair decay ($bbWW^*$, $bb\gamma\gamma$, $bbbb$), our detailed Monte Carlo simulations for the signal and backgrounds show that the best channel is $bbbb+\textrm{E\!\!\!\! \!\slash}_T$, whose statistical significance can reach $2\sigma$ level for a light higgsino allowed by current experiments. This is over the SM Higgs pair result which is about $1.8\sigma$.