Measurements of four-lepton production in pp collisions at √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) PublishedText
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.
IdentifiersURN: 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
QC 201602022016-02-022016-02-022016-03-19Bibliographically approved