Identifying boosted new physics with non-isolated leptons

Abstract

We demonstrate the utility of leptons which fail standard isolation criteria in searches for new physics at the LHC. Such leptons can arise in any event containing a highly boosted particle which decays to both leptons and quarks. We begin by considering multiple extensions to the Standard Model which primarily lead to events with non-isolated leptons and are therefore missed by current search strategies. We emphasize the failure of standard isolation variables to adequately discriminate between signal and SM background for any value of the isolation cuts. We then introduce a new approach which makes use of jet substructure techniques to distinguish a broad range of signals from QCD events. We proceed with a simulated, proof-of-principle search for R-parity violating supersymmetry to demonstrate both the experimental reach possible with the use of non-isolated leptons and the utility of new substructure variables over existing techniques

15 pages plus references, 11 figures; references added

References in corpus (21)

• The anti-k_t jet clustering algorithm
• A Brief Introduction to PYTHIA 8.1
• FastJet user manual
• Theory and phenomenology of two-Higgs-doublet models
• MadGraph 5 : Going Beyond
• Better Jet Clustering Algorithms
• Jet substructure as a new Higgs search channel at the LHC
• Identifying Boosted Objects with N-subjettiness
• Soft Drop
• Jet Trimming
• Squark and gluino hadroproduction
• Pileup Per Particle Identification
• Strategies to Identify Boosted Tops
• The Bulk RS KK-gluon at the LHC
• Jet Shapes with the Broadening Axis
• Efficient Identification of Boosted Semileptonic Top Quarks at the LHC
• Jet Observables Without Jet Algorithms
• SoftKiller, a particle-level pileup removal method
• Search for new physics with same-sign isolated dilepton events with jets and missing transverse energy
• Particle-level pileup subtraction for jets and jet shapes
• Search for resonant t t-bar production in lepton+jets events in pp collisions at sqrt(s) = 7 TeV

Cited by in corpus (15)

• A generic anti-QCD jet tagger
• Review of searches for vector-like quarks, vector-like leptons, and heavy neutral leptons in proton-proton collisions at $\sqrt{s}$ = 13 TeV at the CMS experiment
• Cornering Natural SUSY at LHC Run II and Beyond
• Pileup and Underlying Event Mitigation with Iterative Constituent Subtraction
• Search for a right-handed W boson and a heavy neutrino in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Dedicated Strategies for Triboson Signals from Cascade Decays of Vector Resonances
• Model-agnostic search for dijet resonances with anomalous jet substructure in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Heavy Higgs Bosons at Low $\tan \beta$: from the LHC to 100 TeV
• Detecting a Boosted Diboson Resonance
• Jets with electrons from boosted top quarks
• Ultraboosted $Zt$ and $\gamma t$ production at the HL-LHC and FCC-hh
• Learning to Isolate Muons
• Testing Naturalness
• Fatjet signatures of heavy neutrinos and heavy leptons in a left-right model with universal seesaw at the HL-LHC
• Pulling the Higgs and Top needles from the jet stack with Feature Extended Supervised Tagging