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Measurement of the Higgs boson properties in the WW(*) →, ℓvℓv decay mode with the ATLAS detector at the LHC
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
2013 (English)In: Proceedings of Science, 2013Conference paper (Refereed)
Abstract [en]

This article describes the measurements of the Higgs boson properties in the H → WW(*) → ℓvℓv (ℓ = e,μ) decay mode using the ATLAS detector at the CERN Large Hadron Collider. The results are obtained using the proton-proton collisions dataset which corresponds to an integrated luminosity of 20.7 fb-1 at a centre of mass energy of 8 TeV and 4.6 fb-1 at 7 TeV. An excess over the expected number of background events is observed in the data. The significance of the excess for the Higgs boson with a mass of 125 GeV is estimated to be 3.8 standard deviations, while the expected value is 3.7. The signal strength μ, defined as a ratio of the cross-section for the observed signal to the cross section predicted for a Standard Model Higgs boson with a mass of 125 GeV, is measured to be μ = 1.01 ±0.31. The results obtained by including the H → WW(*) → ℓvℓv channel where the Higgs boson is produced in association with aWoraZ boson which decay leptonically are also reported. Finally, results of the searches for resonances up to 1 TeV are briefly summarised. An additional signal with the Standard Model like production cross-section and couplings is excluded in the range 260 < mH < 642 GeV.

Place, publisher, year, edition, pages
, Proceedings of Science, ISSN 1824-8039
Keyword [en]
Centre-of-mass energies, Integrated luminosity, Large Hadron Collider, Production cross-section, Proton proton collisions, Standard deviation, Standard-model Higgs bosons, The standard model, Bosons, Tellurium compounds, High energy physics
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-151058ScopusID: 2-s2.0-84887464883OAI: diva2:747047
2013 European Physical Society Conference on High Energy Physics, EPS-HEP 2013, 18 July 2013 through 24 July 2013, Stockholm, Sweden

QC 20140915

Available from: 2014-09-15 Created: 2014-09-15 Last updated: 2014-09-15Bibliographically approved

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Jovicevic, Jelena
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