New Physics Opportunities in the Boosted Di-Higgs plus \ET Signature

TL;DR

This paper proposes a new collider signature involving boosted di-Higgs bosons and missing transverse energy to explore new physics sectors related to dark matter and neutrinos, with potential to probe particles up to several hundred GeV at the HL-LHC.

Contribution

It introduces a novel collider signature for probing dark matter and neutrino-related new physics, applicable to various models like SUSY, seesaw, and little Higgs, with detailed sensitivity estimates.

Findings

Can probe Higgsino masses up to ~500 GeV.

Can probe right-handed neutrino masses up to ~650 GeV.

Can probe heavy vector bosons up to ~900 GeV.

Abstract

The Higgs field in the standard model (SM) may couple to new physics sectors related with dark matter and/or massive neutrinos. In this paper we propose a novel signature, the boosted di-Higgs boson plus \ET (which is either a dark matter or neutrino), to probe those new physics sectors. In a large class of models, in particular the supersymmetric SMs and low scale seesaw mechanisms, this signature can play a key role. The signature has clear background, and at the $\sqrt s=$14 TeV high luminosity (HL-)LHC, we can probe it with production rate as low as $\sim$ 0.1 fb. We apply it to benchmark models, supersymmetry in the bino-Higgsino limit, the canonical seesaw model and little Higgs model, finding that masses of Higgsino, right-handed neutrino and heavy vector boson can be probed up to $\sim$ 500 GeV, 650 GeV and 900 GeV, respectively.