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Measurements of four-lepton production in pp collisions at √s = 8 TeV with the ATLAS detector
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Measurements of four-lepton production in pp collisions at √s = 8 TeV with the ATLAS detector

G. Aad, B. Abbott, J. Abdallah, O. Abdinov, R. Aben, M. Abolins, O.S. AbouZeid, H. Abramowicz, H. Abreu, R. Abreu, …
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 卷.753, 頁碼.552-572
02/2016
DOI: https://doi.org/10.1016/j.physletb.2015.12.048

摘要

Nuclear and High Energy Physics
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 μ gg =2.4±1.0 (stat.)±0.5 (syst.)±0.8 (theory).

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