Combination of searches for Higgs boson pairs in pp collisions at with the ATLAS detector

Research output: Contribution to journalArticle

  • External authors:
  • Agni Bethani
  • Brian Cox
  • Cinzia Da Via
  • Nicholas Dann
  • Alessandra Forti
  • Jiri Masik
  • Stephen Menary
  • Alexander Oh
  • Joleen Pater
  • Yvonne Peters
  • Yang Qin
  • Savanna Shaw
  • Stephen Watts
  • Terence Wyatt
  • The ATLAS Collaboration

Abstract

This letter presents a combination of searches for Higgs boson pair production using up to 36.1 of proton–proton collision data at a centre-of-mass energy TeV recorded with the ATLAS detector at the LHC. The combination is performed using six analyses searching for Higgs boson pairs decaying into the , , , , and final states. Results are presented for non-resonant and resonant Higgs boson pair production modes. No statistically significant excess in data above the Standard Model predictions is found. The combined observed (expected) limit at 95% confidence level on the non-resonant Higgs boson pair production cross-section is 6.9 (10) times the predicted Standard Model cross-section. Limits are also set on the ratio () of the Higgs boson self-coupling to its Standard Model value. This ratio is constrained at 95% confidence level in observation (expectation) to (). In addition, limits are set on the production of narrow scalar resonances and spin-2 Kaluza–Klein Randall–Sundrum gravitons. Exclusion regions are also provided in the parameter space of the habemus Minimal Supersymmetric Standard Model and the Electroweak Singlet Model.

Bibliographical metadata

Original languageEnglish
JournalPhysics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
Early online date19 Nov 2019
DOIs
Publication statusPublished - 2019