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
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 a...
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| Formato: | JOUR |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_15507998_v91_n1_p_Aad |
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| Sumario: | 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 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 . © 2015 CERN, for the ATLAS Collaboration. |
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