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Constraints on the off-shell Higgs boson signal strength in the high-mass ZZ and WW final states with the ATLAS detector

Measurements of the ZZ and WW final states in the mass range above the 2mZ and 2mW 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 predict...

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Main Authors: Aad, Georges (Author) , Anders, Christoph (Author) , Andrei, George Victor (Author) , Baas, Alessandra Edda (Author) , Brandt, Oleg (Author) , Djuvsland, Julia Isabell (Author) , Dunford, Monica (Author) , Geisler, Manuel Patrice (Author) , Hanke, Paul (Author) , Jongmanns, Jan (Author) , Kluge, Eike-Erik (Author) , Kugel, Andreas (Author) , Lang, Valerie (Author) , Meier, Karlheinz (Author) , Schätzel, Sebastian (Author) , Scharf, Veit (Author) , Schmitt, Sebastian (Author) , Schöning, André (Author) , Schultz-Coulon, Hans-Christian (Author) , Sosa Corral, David E. (Author) , Stamen, Rainer (Author) , Wessels, Martin (Author)
Corporate Author: ATLAS Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 17 July 2015
In: The European physical journal. C, Particles and fields
Year: 2015, Volume: 75, Issue: 7, Pages: 1-34
ISSN:1434-6052
DOI:10.1140/epjc/s10052-015-3542-2
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1140/epjc/s10052-015-3542-2
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Author Notes:ATLAS Collaboration*
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Summary:Measurements of the ZZ and WW final states in the mass range above the 2mZ and 2mW 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 ZZ→4ℓ, ZZ→2ℓ2ν and WW→eνμν 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−1 at a collision energy of s√=8 TeV. Using the CLs method, the observed 95 % 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 gg→ZZ and gg→WW 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 % CL upper limit on ΓH/ΓSMH in the range 4.5–7.5 (6.5–11.2) using the same variations of the background K-factor. Assuming that the unknown gg→VV background K-factor is equal to the signal K-factor, this translates into an observed (expected) 95 % CL upper limit on the Higgs boson total width of 22.7 (33.0) MeV.
Item Description:*ATLAS Collaboration: G. Aad, C.F. Anders, V. Andrei, A. Baas, O. Brandt, J.I. Djuvsland, M. Dunford, M. Geisler, P. Hanke, J. Jongmanns, E.-E. Kluge, A. Kugel, V. Lang, K. Meier, S. Schaetzel, V. Scharf, S. Schmitt, A. Schoening, H.-C. Schultz-Coulon, D. Sosa, R. Stamen, M. Wessels [und 2801 weitere Personen]
Gesehen am 08.07.2021
Physical Description:Online Resource
ISSN:1434-6052
DOI:10.1140/epjc/s10052-015-3542-2

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