Measurements of four-lepton production in pp collisions at √s=8 TeV with the ATLAS detector
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Article history: Received 28 September 2015 Received in revised form 4 December 2015 Accepted 16 December 2015 Available online 18 December 2015 Editor: W.-D. Schlatter The four-lepton (4 , = 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 4 events are produced in the decays of resonant Z and Higgs bosons and the nonresonant Z Z continuum originating from qq̄, 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 qq̄ 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). © 2015 CERN for the benefit of the ATLAS Collaboration. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3.
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تاریخ انتشار 2016