[submitted] Journal of Physical Review D

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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
ATLAS Collaboration (Georges Aad (Marseille, CPPMet al.) Show all 2898 authors

Aug 21, 2014 - 40 pages

Abstract (arXiv)
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 fb−1 and 20.3 fb−1 at center-of-mass energies of 7 TeV 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 at 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.

Note: 40 pages plus author list + cover pages (54 pages total), 21 figures, 12 tables, submitted to Physical Review D, All figures including auxiliary figures are available at 
Keyword(s): INSPIRE: * Automatic Keywords * | Higgs particle: production | p p: scattering | Higgs particle: mass | vector boson: fusion | gluon: fusion | top: pair production | ATLAS | category | associated production | CERN LHC Coll


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