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000224407 0881_ $$aATLAS-CONF-2015-031
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000224407 245__ $$aMeasurements of four-lepton production in pp collisions at $\sqrt{s}= 8$ TeV with the ATLAS detector
000224407 260__ $$c2015
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000224407 520__ $$aThe four-lepton (4ℓ, ℓ=e,μ) production is measured in a mass range from 80 to 1000 GeV using 20.3 fb−1 of data in pp collisions at s√=8 TeV at the LHC with the ATLAS detector. The 4ℓ signal events come from the decays of resonant Z and Higgs bosons and the non-resonant ZZ continuum produced from qq¯, gg, and qg initial states. A total of 476 signal candidate events is 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 next-to-next-to leading order (NNLO) QCD and next-to-leading order (NLO) Electroweak corrections, the signal strength of the gluon-fusion component with respect to the leading order (LO) prediction is determined to be μgg=2.4±1.0(stat.)±0.5(syst.)±0.8(theory)
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