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Measurements of four-lepton production in pp collisions at √s = 8 TeV with the ATLAS detector
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-8913-0981
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Number of Authors: 2864
2016 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 753, 552-572 p.Article in journal (Refereed) PublishedText
Abstract [en]

The four-lepton (4ℓ, ℓ=e, μ) production cross section is measured in the mass range from 80 to 1000 GeV using 20.3 fb-1 of data in pp collisions at s=8 TeV collected with the ATLAS detector at the LHC. The 4ℓ events are produced in the decays of resonant Z and Higgs bosons and the non-resonant ZZ continuum originating from qq-, gg, and qg initial states. A total of 476 signal candidate events are observed with a background expectation of 26.2±3.6 events, enabling the measurement of the integrated cross section and the differential cross section as a function of the invariant mass and transverse momentum of the four-lepton system. In the mass range above 180 GeV, assuming the theoretical constraint on the qq- production cross section calculated with perturbative NNLO QCD and NLO electroweak corrections, the signal strength of the gluon-fusion component relative to its leading-order prediction is determined to be μgg=2.4±1.0 (stat.)±0.5 (syst.)±0.8 (theory).

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 753, 552-572 p.
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Subatomic Physics
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URN: urn:nbn:se:kth:diva-181424DOI: 10.1016/j.physletb.2015.12.048ISI: 000368783600077ScopusID: 2-s2.0-84953257821OAI: oai:DiVA.org:kth-181424DiVA: diva2:899502
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QC 20160202

Available from: 2016-02-02 Created: 2016-02-02 Last updated: 2016-03-19Bibliographically approved

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Lund-Jensen, BengtSidebo, EdvinStrandberg, Jonas
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Particle and Astroparticle Physics
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Subatomic Physics

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