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

Abraham, N L, Allbrooke, B M M, Asquith, L, Cerri, A, Chavez Barajas, C A, De Santo, A, Jones, S D, Lerner, G, Miano, F, Salvatore, F, Santoyo Castillo, I, Shehu, C Y, Shaw, K, Stevenson, T J, Suruliz, K, Sutton, M R, Tresoldi, F, Vivarelli, I, Winkels, E, Winston, O J, The ATLAS Collaboration, and others, (2018) Search for Higgs boson decays to beyond-the-Standard-Model light bosons in four-lepton events with the ATLAS detector at √s =13 TeV. Journal of High Energy Physics, 9 (6). 166 1-50. ISSN 1126-6708

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Abstract

A search is conducted for a new 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 Z d 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 model-independent fiducial cross-sections, and on the Higgs boson decay branching ratios to vector and pseudoscalar bosons in two benchmark models.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Experimental Particle Physics Research Group
Subjects: Q Science > QC Physics
Depositing User: Alice Jackson
Date Deposited: 12 Nov 2018 09:48
Last Modified: 12 Nov 2018 15:04
URI: http://srodev.sussex.ac.uk/id/eprint/80111

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