Search for non-resonant Higgs boson pair production in final states with leptons, taus, and photons in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector

Abstract

A search is presented for non-resonant Higgs boson pair production, targeting the $bbZZ$, 4$V$ ($V$ = $W$ or $Z$), $VV\tau \tau$, 4$\tau$, $\gamma \gamma VV$ and $\gamma \gamma \tau \tau$ decay channels. Events are categorised based on the multiplicity of light charged leptons (electrons or muons), hadronically decaying tau leptons, and photons. The search is based on a data sample of proton-proton collisions at $\sqrt{s}$ = 13 TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of 140 fb${}^{-1}$. No evidence of the signal is found and the observed (expected) upper limit on the cross-section for non-resonant Higgs boson pair production is determined to be 17 (11) times the Standard Model predicted cross-section at 95% confidence level under the background-only hypothesis. The observed (expected) constraints on the $HHH$ coupling modifier, ${\kappa }_{\lambda }$, are determined to be $-6.2<{\kappa }_{\lambda }<11.6$ ($-4.5<{\kappa }_{\lambda }<9.6$) at 95% confidence level, assuming the Standard Model for the expected limits and that new physics would only affect ${\kappa }_{\lambda }$.

60 pages total, author list starting page 43, 10 figures, 10 tables, published in JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2019-04

References in corpus (11)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• An Introduction to PYTHIA 8.2
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• Herwig++ Physics and Manual
• The Standard Model Higgs boson as the inflaton
• Parton distributions in the LHC era: MMHT 2014 PDFs
• A parton shower algorithm based on Catani-Seymour dipole factorisation
• Single-top Wt-channel production matched with parton showers using the POWHEG method
• Colour reconnections in Herwig++
• Vector-Boson Fusion Higgs Pair Production at N${}^3$LO
• Higgs Self-Coupling as a Probe of Electroweak Phase Transition

Cited by in corpus (7)

• Characterising the Higgs boson with ATLAS data from Run 2 of the LHC
• Monojets from compressed weak frustrated dark matter
• Extracting Higgs Self-Coupling Constraints through Triple Higgs Boson Production at Future Hadron Colliders
• Study of Higgs boson pair production in the $HH\to b\overline{b}\gamma \gamma$ final state with 308 fb${}^{-1}$ of data collected at $\sqrt{s}=$ 13 TeV and 13.6 TeV by the ATLAS experiment
• LHC Signatures of the Generic Georgi-Machacek Model
• Interpretation of LHC excesses at 95 GeV and 152 GeV in an extended Georgi-Machacek model
• Electroweak Higgs boson pair production: Updated inclusive cross sections