Scale-invariant resonance tagging in multijet events and new physics in Higgs pair production

TL;DR

This paper introduces a new jet substructure technique for resonance tagging in multijet events, enabling uniform analysis across different mass regimes and improving searches for Higgs pair production in new physics scenarios.

Contribution

It proposes a novel resonance tagging method that seamlessly covers boosted and resolved regimes, unifying experimental searches into a single, efficient analysis framework.

Findings

Method achieves consistent signal efficiency across mass ranges.

Enables effective Higgs pair production searches despite QCD background.

Provides a complementary approach to existing LHC analyses.

Abstract

We study resonant pair production of heavy particles in fully hadronic final states by means of jet substructure techniques. We propose a new resonance tagging strategy that smoothly interpolates between the highly boosted and fully resolved regimes, leading to uniform signal efficiencies and background rejection rates across a broad range of masses. Our method makes it possible to efficiently replace independent experimental searches, based on different final state topologies, with a single common analysis. As a case study, we apply our technique to pair production of Higgs bosons decaying into $b\bar{b}$ pairs in generic New Physics scenarios. We adopt as benchmark models radion and massive KK graviton production in warped extra dimensions. We find that despite the overwhelming QCD background, the $4b$ final state has enough sensitivity to provide a complementary handle in searches for enhanced Higgs pair production at the LHC.