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

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 co...

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Autor principal: Aad, G.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_03702693_v753_n_p552_Aad
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_03702693_v753_n_p552_Aad2023-10-03T15:29:42Z Measurements of four-lepton production in pp collisions at √s=8 TeV with the ATLAS detector Aad, G. 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). © 2015 CERN for the benefit of the ATLAS Collaboration JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03702693_v753_n_p552_Aad
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description 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). © 2015 CERN for the benefit of the ATLAS Collaboration
format JOUR
author Aad, G.
spellingShingle Aad, G.
Measurements of four-lepton production in pp collisions at √s=8 TeV with the ATLAS detector
author_facet Aad, G.
author_sort Aad, G.
title Measurements of four-lepton production in pp collisions at √s=8 TeV with the ATLAS detector
title_short Measurements of four-lepton production in pp collisions at √s=8 TeV with the ATLAS detector
title_full Measurements of four-lepton production in pp collisions at √s=8 TeV with the ATLAS detector
title_fullStr Measurements of four-lepton production in pp collisions at √s=8 TeV with the ATLAS detector
title_full_unstemmed Measurements of four-lepton production in pp collisions at √s=8 TeV with the ATLAS detector
title_sort measurements of four-lepton production in pp collisions at √s=8 tev with the atlas detector
url http://hdl.handle.net/20.500.12110/paper_03702693_v753_n_p552_Aad
work_keys_str_mv AT aadg measurementsoffourleptonproductioninppcollisionsats8tevwiththeatlasdetector
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