Abstract
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\overline{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.
Highlights
These results confirm that the 4b final state can be relevant for many new physics scenarios that lead to enhanced cross sections for resonant Higgs pair production, and the search strategy that we propose makes it possible to efficiently explore a wide range of resonance masses within a common analysis
In this paper we have presented a new strategy for heavy-resonance searches in multijet final states, which attempts to unify in a single approach the techniques used in the boosted and resolved regimes
By classifying events as a function of the number of mass-drop tags, we can smoothly interpolate between the boosted regime, where jet substructure techniques can be used, and the resolved regime, where the final state particles appear as well separated jets
Summary
Multijet signatures have long been recognized as an important channel for Beyond the Standard Model searches at hadron colliders [36]. If the two hardest jets in the event are mass-drop tagged, we examine if these two jets can be identified as arising from the decay products of two boosted Y resonances This is established by verifying if the two Y candidates satisfy the quality conditions on their mass difference and angular separation listed below, in which case the event is assigned to the 2-tag sample. To prevent excessively asymmetric configurations, whenever we have two resolved jets that correspond to a given Y -candidate, one with p(T1) and the other with p(T2) ≤ p(T1) (in either the 1-tag sample or the 0-tag sample), we require p(T2) ≥ ycut · p(T1) This cut plays a similar role as the asymmetry requirement in the BDRS mass-drop tagger, eq (2.7), but in the case of resolved jets, and it helps reject events where a soft jet arises from final-state radiation (FSR).. There will be a substantial degree of overlap between the decays products of the two Higgs bosons, since the two are at
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