Measurements of four-lepton production in pp collisions at root s=8 TeV with the ATLAS detector
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) Published
The four-lepton (4l, l = e, mu) production cross section is measured in the mass range from 80 to 1000GeV using 20.3 fb(-1)of data in pp collisions at root s = 8 TeV collected with the ATLAS detector at the LHC. The 4l events are produced in the decays of resonant Zand Higgs bosons and the nonresonant ZZcontinuum originating from q (q) over bar, 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 180GeV, assuming the theoretical constraint on the q (q) over bar 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 mu(gg) = 2.4 +/- 1.0(stat.) +/- 0.5(syst.) +/- 0.8(theory). (C) 2015 CERN for the benefit of the ATLAS Collaboration.
Place, publisher, year, edition, pages
2016. Vol. 753, 552-572 p.
IdentifiersURN: urn:nbn:se:su:diva-128191DOI: 10.1016/j.physletb.2015.12.048ISI: 000368783600077OAI: oai:DiVA.org:su-128191DiVA: diva2:914021