Studies of new Higgs boson interactions through nonresonant HH production in the bb¯γγ final state in pp collisions at √s = 13 TeV with the ATLAS detector

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • University of Oklahoma
  • University of Göttingen
  • Dortmund University of Technology
  • Brookhaven National Laboratory
  • Mohammed V University in Rabat
  • Tel Aviv University
  • Technion-Israel Institute of Technology
  • New York University
  • National Institute for Nuclear Physics
  • Abdus Salam International Centre for Theoretical Physics
  • King's College London (KCL)
  • Laboratoire d'Annecy-le-Vieux de Physique des Particules LAPP
  • AGH University of Science and Technology
  • Brandeis University
  • University of Manchester
  • Northern Illinois University
  • Istanbul University
  • Rutherford Appleton Laboratory
  • University of California at Santa Cruz
  • Institute for High Energy Physics
  • University of Pavia
  • Johannes Gutenberg University Mainz
  • Alexandru Ioan Cuza University of Iaşi
  • Azerbaijan National Academy of Sciences
  • McGill University
  • Royal Holloway University of London
  • University of Science and Technology of China (USTC)
  • University of Rome Tor Vergata

Abstract

A search for nonresonant Higgs boson pair production in the bb¯γγ final state is performed using 140 fb−1 of proton-proton collisions at a centre-of-mass energy of 13 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. This analysis supersedes and expands upon the previous nonresonant ATLAS results in this final state based on the same data sample. The analysis strategy is optimised to probe anomalous values not only of the Higgs (H) boson self-coupling modifier κλ but also of the quartic HHVV (V = W, Z) coupling modifier κ2V. No significant excess above the expected background from Standard Model processes is observed. An observed upper limit μHH < 4.0 is set at 95% confidence level on the Higgs boson pair production cross-section normalised to its Standard Model prediction. The 95% confidence intervals for the coupling modifiers are −1.4 < κλ < 6.9 and −0.5 < κ2V < 2.7, assuming all other Higgs boson couplings except the one under study are fixed to the Standard Model predictions. The results are interpreted in the Standard Model effective field theory and Higgs effective field theory frameworks in terms of constraints on the couplings of anomalous Higgs boson (self-)interactions.

Details

Original languageEnglish
Article number66
Pages (from-to)1-47
Number of pages48
JournalJournal of high energy physics
Volume2024
Issue number1
Publication statusPublished - 12 Jan 2024
Peer-reviewedYes

External IDs

ORCID /0000-0001-6480-6079/work/173049563
ORCID /0000-0003-0546-1634/work/173516684

Keywords

ASJC Scopus subject areas

Keywords

  • Hadron-Hadron Scattering, Higgs Physics