Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/102042
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Type: Journal article
Title: Measurements of Higgs boson production and couplings in the four-lepton channel in pp collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector
Author: Aad, G.
Abbott, B.
Abdallah, J.
Abdel Khalek, S.
Abdinov, O.
Aben, R.
Abi, B.
Abolins, M.
AbouZeid, O.
Abramowicz, H.
Abreu, H.
Abreu, R.
Abulaiti, Y.
Acharya, B.
Adamczyk, L.
Adams, D.
Adelman, J.
Adomeit, S.
Adye, T.
Agatonovic-Jovin, T.
et al.
Citation: Physical Review D - Particles, Fields, Gravitation and Cosmology, 2015; 91(1):012006-1-012006-47
Publisher: American Physical Society
Issue Date: 2015
ISSN: 1550-7998
1550-2368
Statement of
Responsibility: 
G. Aad ... P. Jackson ... L. Lee ... A. Petridis ... N. Soni ... M.J. White ... et al. (ATLAS Collaboration)
Abstract: The final ATLAS Run 1 measurements of Higgs boson production and couplings in the decay channel H → ZZ* → ℓ⁻ℓ⁻ℓ'⁺ℓ'⁻, where ℓ, ℓ′ = e or μ, are presented. These measurements were performed using pp collision data corresponding to integrated luminosities of 4.5 and 20.3  fb⁻¹ at center-of-mass energies of 7 and 8 TeV, respectively, recorded with the ATLAS detector at the LHC. The H → ZZ* → 4ℓ signal is observed with a significance of 8.1 standard deviations, with an expectation of 6.2 standard deviations, at mΗ = 125.36  GeV, the combined ATLAS measurement of the Higgs boson mass from the H → γγ and H → ZZ* → 4ℓ channels. The production rate relative to the Standard Model expectation, the signal strength, is measured in four different production categories in the H → ZZ* → 4ℓ channel. The measured signal strength, at this mass, and with all categories combined, is 1.44+0.40−0.33. The signal strength for Higgs boson production in gluon fusion or in association with tt¯ or bb¯ pairs is found to be 1.7+0.5−0.4, while the signal strength for vector-boson fusion combined with WH/ZH associated production is found to be 0.3+1.6−0.9.
Rights: © 2015 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published articles title, journal citation, and DOI.
RMID: 0030021666
DOI: 10.1103/PhysRevD.91.012006
Appears in Collections:Physics publications

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