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Abstract:

Measurements of the ZZ and WW final states in the mass range above the 2m Z and 2m W 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 CL s 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 Γ H /Γ SM H 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. © CERN for the benefit of the ATLAS collaboration 2015.

Registro:

Documento: Artículo
Título:Constraints on the off-shell Higgs boson signal strength in the high-mass ZZ and WW final states with the ATLAS detector
Autor:Aad, G. et al.
Este artículo contiene 2811 autores, consultelos en el artículo en formato pdf.
Filiación: Este artículo contiene 2811 autores con sus filiaciones, consultelas en el artículo en formato pdf.
Año:2015
Volumen:75
Número:7
Página de inicio:1
Página de fin:34
DOI: http://dx.doi.org/10.1140/epjc/s10052-015-3542-2
Título revista:European Physical Journal C
Título revista abreviado:Eur. Phys. J. C
ISSN:14346044
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14346044_v75_n7_p1_Aad

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Citas:

---------- APA ----------
(2015) . 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, 75(7), 1-34.
http://dx.doi.org/10.1140/epjc/s10052-015-3542-2
---------- CHICAGO ----------
Aad, G. "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 75, no. 7 (2015) : 1-34.
http://dx.doi.org/10.1140/epjc/s10052-015-3542-2
---------- MLA ----------
Aad, G. "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, vol. 75, no. 7, 2015, pp. 1-34.
http://dx.doi.org/10.1140/epjc/s10052-015-3542-2
---------- VANCOUVER ----------
Aad, G. Constraints on the off-shell Higgs boson signal strength in the high-mass ZZ and WW final states with the ATLAS detector. Eur. Phys. J. C. 2015;75(7):1-34.
http://dx.doi.org/10.1140/epjc/s10052-015-3542-2