• Open Access

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

G. Aad et al. (ATLAS Collaboration)
Phys. Rev. D 91, 012006 – Published 16 January 2015

Abstract

The final ATLAS Run 1 measurements of Higgs boson production and couplings in the decay channel HZZ*++, where , =e or μ, are presented. These measurements were performed using pp collision data corresponding to integrated luminosities of 4.5 and 20.3fb1 at center-of-mass energies of 7 and 8 TeV, respectively, recorded with the ATLAS detector at the LHC. The HZZ*4 signal is observed with a significance of 8.1 standard deviations, with an expectation of 6.2 standard deviations, at mH=125.36GeV, the combined ATLAS measurement of the Higgs boson mass from the Hγγ and HZZ*4 channels. The production rate relative to the Standard Model expectation, the signal strength, is measured in four different production categories in the HZZ*4 channel. The measured signal strength, at this mass, and with all categories combined, is 1.440.33+0.40. The signal strength for Higgs boson production in gluon fusion or in association with tt¯ or bb¯ pairs is found to be 1.70.4+0.5, while the signal strength for vector-boson fusion combined with WH/ZH associated production is found to be 0.30.9+1.6.

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  • Received 22 August 2014

DOI:https://doi.org/10.1103/PhysRevD.91.012006

This article is available 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 article’s title, journal citation, and DOI.

© 2015 CERN, for the ATLAS Collaboration

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Vol. 91, Iss. 1 — 1 January 2015

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