Observation and measurement of Higgs boson decays to WW* with the ATLAS detector

ATLAS, Collaboration; Agustoni, Marco; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Haug, Sigve; Kabana, Sonja; Marti, Lukas; Meloni, Federico; Pretzl, Klaus-Peter; Stramaglia, Maria Elena; Stucci, Stefania; Weber, Michael (2015). Observation and measurement of Higgs boson decays to WW* with the ATLAS detector. Physical review. D - particles, fields, gravitation, and cosmology, D92(1), 012006. American Physical Society 10.1103/PhysRevD.92.012006

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We report the observation of Higgs boson decays to WW∗ based on an excess over background of 6.1 standard deviations in the dilepton final state, where the Standard Model expectation is 5.8 standard deviations. Evidence for the vector-boson fusion (VBF) production process is obtained with a significance of 3.2 standard deviations. The results are obtained from a data sample corresponding to an integrated luminosity of 25fb⁻¹ from √s=7 and 8 TeV pp collisions recorded by the ATLAS detector at the LHC. For a Higgs boson mass of 125.36 GeV, the ratio of the measured value to the expected value of the total production cross section times branching fraction is 1.09 +0.16 −0.15 (stat) +0.17 −0.14 (syst) . The corresponding ratios for the gluon fusion and vector-boson fusion production mechanisms are 1.02±0.19(stat) +0.22 −0.18 (syst) and 1.27 +0.44 −0.40 (stat) +0.30 −0.21 (syst) , respectively. At √s=8 TeV, the total production cross sections are measured to be σ(gg→ H→WW ∗ )=4.6±0.9(stat) +0.8 −0.7 (syst)pb and σ(VBF H→WW ∗ )=0.51 +0.17 −0.15 (stat) +0.13 −0.08 (syst)pb . The fiducial cross section is determined for the gluon-fusion process in exclusive final states with zero or one associated jet.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Agustoni, Marco; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Haug, Sigve; Marti, Lukas; Meloni, Federico; Pretzl, Klaus-Peter; Stramaglia, Maria Elena; Stucci, Stefania and Weber, Michael

Subjects:

500 Science > 530 Physics

ISSN:

1550-7998

Publisher:

American Physical Society

Language:

English

Submitter:

Annette Krebs-Wegenast

Date Deposited:

12 Sep 2016 09:25

Last Modified:

18 Sep 2016 02:07

Publisher DOI:

10.1103/PhysRevD.92.012006

ArXiv ID:

1412.2641

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt

BORIS DOI:

10.7892/boris.87672

URI:

https://boris.unibe.ch/id/eprint/87672

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