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; Agustoni, Marco; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Haug, Sigve; Kabana, Sonja; Kruker, Tobias; Marti, Lukas; Meloni, Federico; Pretzl, Klaus-Peter; Schneider, Basil; Sciacca, Gianfranco; Stramaglia, Maria Elena; Stucci, Stefania; Weber, Michael (2015). 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. Physical review. D - particles, fields, gravitation, and cosmology, 91(1) American Physical Society 10.1103/PhysRevD.91.012006

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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, with an expectation of 6.2 standard deviations, at m H = 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 .

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