Article
Constraints on the off-shell Higgs boson signal strength in the high-mass ZZ and WW final states with the ATLAS detector
European Physical Journal C, Springer Nature, ISSN 1434-6044
Volume 75, 7, 2015
DOI:10.1140/epjc/s10052-015-3542-2, Dimensions: pub.1017926770, PMC: PMC4509704, PMID: 26213488,
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Description
Measurements of the ZZ and WW final states in the mass range above the [Formula: see text] and [Formula: see text] thresholds provide a unique opportunity to measure the off-shell coupling strength of the Higgs boson. This paper presents constraints on the off-shell Higgs boson event yields normalised to the Standard Model prediction (signal strength) in the [Formula: see text], [Formula: see text] and [Formula: see text] final states. The result is based on pp collision data collected by the ATLAS experiment at the LHC, corresponding to an integrated luminosity of 20.3 fb[Formula: see text] at a collision energy of [Formula: see text] TeV. Using the [Formula: see text] method, the observed 95 [Formula: see text] confidence level (CL) upper limit on the off-shell signal strength is in the range 5.1-8.6, with an expected range of 6.7-11.0. In each case the range is determined by varying the unknown [Formula: see text] and [Formula: see text] background K-factor from higher-order quantum chromodynamics corrections between half and twice the value of the known signal K-factor. Assuming the relevant Higgs boson couplings are independent of the energy scale of the Higgs boson production, a combination with the on-shell measurements yields an observed (expected) 95 [Formula: see text] CL upper limit on [Formula: see text] in the range 4.5-7.5 (6.5-11.2) using the same variations of the background K-factor. Assuming that the unknown [Formula: see text] background K-factor is equal to the signal K-factor, this translates into an observed (expected) 95 [Formula: see text] CL upper limit on the Higgs boson total width of 22.7 (33.0) MeV.
Funders
- Ministry of Science and Technology of the People's Republic of China
- Chinese Academy of Sciences
- Japan Society for the Promotion of Science
- Slovenian Research Agency
- Science and Technology Facilities Council
- Ministry of Education, Science and Sport
- Israel Science Foundation
- German Research Foundation
- National Natural Science Foundation of China
- Ministry of Education Youth and Sports
- Leverhulme Trust
- Comisión Nacional de Investigación Científica y Tecnológica
- Agencia Nacional de Promoción Científica y Tecnológica
- French National Centre for Scientific Research
- European Research Council
- Atomic Energy and Alternative Energies Commission
- São Paulo Research Foundation
- Foundation for Science and Technology
- Alexander von Humboldt Foundation
- Swiss National Science Foundation
- Ministry of Economy, Industry and Competitiveness
- Federal Ministry of Education and Research
- Royal Society
- Brookhaven National Laboratory
- European Commission
- National Council for Scientific and Technological Development
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