TY  - EJOUR
TI  - Measurements of four-lepton production in pp collisions at √s = 8 TeV with the ATLAS detector
IS  - ATLAS-CONF-2015-031
M1  - PUBDB-2015-03547
M1  - ATLAS-CONF-2015-031
SP  - 1-28
PY  - 2015
AB  - The 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)
LB  - PUB:(DE-HGF)25 ; PUB:(DE-HGF)15
UR  - https://bib-pubdb1.desy.de/record/224407
ER  -