Search for Higgs boson decays to beyond-the-Standard-Model light bosons in four-lepton events with the ATLAS detector at √s=13 TeV

Summary, in English

A search is conducted for a beyond-the-Standard-Model boson using events where a Higgs boson with mass 125 GeV decays to four leptons (ℓ = e or μ). This decay is presumed to occur via an intermediate state which contains one or two on-shell, promptly decaying bosons: H → ZX/XX → 4ℓ, where X is a new vector boson Zd or pseudoscalar a with mass between 1 and 60 GeV. The search uses pp collision data collected with the ATLAS detector at the LHC with an integrated luminosity of 36.1 fb−1 at a centre-of-mass energy s=13 TeV. No significant excess of events above Standard Model background predictions is observed; therefore, upper limits at 95% confidence level are set on modelindependent fiducial cross-sections, and on the Higgs boson decay branching ratios to vector and pseudoscalar bosons in two benchmark models.[Figure not available: see fulltext.]. © 2018, The Author(s).

• Author: M Aaboud; G Aad; B. Abbott; O Abdinov; B Abeloos; S. H. Abidi; Torsten Åkesson; Simona Bocchetta; Caterina Doglioni; Vincent Hedberg; Göran Jarlskog; Charles Kalderon; Edgar Kellermann; Else Lytken; Katja Mankinen; Ulf Mjörnmark; Ruth Pöttgen; Trine Poulsen; Oxana Smirnova; Oleksandr Viazlo
• Department/s: Particle and nuclear physics; eSSENCE: The e-Science Collaboration
• Publishing year: 2018-06-01
• Language: English
• Publication/Series: Journal of High Energy Physics
• Volume: 2018
• Issue: 6
• Links: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85049554080&doi=10.1007%2fJHEP06%282018%29166&partnerID=40&md5=be8bccbf8717d6b67dc85b8a2fb5bd32; http://dx.doi.org/10.1007/JHEP06(2018)166
• Document type: Journal article
• Publisher: Springer
• Topic: Subatomic Physics
• Keywords: Beyond Standard Model; Hadron-Hadron scattering (experiments)
• Status: Published
• ISBN/ISSN/Other: ISSN: 1029-8479