Measurements of Zγ and Zγγ production in pp collisions at s =8 TeV with the ATLAS detector

The production of Z bosons with one or two isolated high-energy photons is studied using pp collisions at s=8 TeV. The analyses use a data sample with an integrated luminosity of 20.3 fb-1 collected by the ATLAS detector during the 2012 LHC data taking. The Zγ and Zγγ production cross sections are m...

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Autor principal: Aad, G.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_24700010_v93_n11_p_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_24700010_v93_n11_p_Aad2023-10-03T16:41:51Z Measurements of Zγ and Zγγ production in pp collisions at s =8 TeV with the ATLAS detector Aad, G. The production of Z bosons with one or two isolated high-energy photons is studied using pp collisions at s=8 TeV. The analyses use a data sample with an integrated luminosity of 20.3 fb-1 collected by the ATLAS detector during the 2012 LHC data taking. The Zγ and Zγγ production cross sections are measured with leptonic (e+e-, μ+μ-, νν) decays of the Z boson, in extended fiducial regions defined in terms of the lepton and photon acceptance. They are then compared to cross-section predictions from the Standard Model, where the sources of the photons are radiation off initial-state quarks and radiative Z-boson decay to charged leptons, and from fragmentation of final-state quarks and gluons into photons. The yields of events with photon transverse energy ET>250 GeV from +-γ events and with ET>400 GeV from ννγ events are used to search for anomalous triple gauge-boson couplings ZZγ and Zγγ. The yields of events with diphoton invariant mass mγγ>200 GeV from +-γγ events and with mγγ>300 GeV from ννγγ events are used to search for anomalous quartic gauge-boson couplings ZZγγ and Zγγγ. No deviations from Standard Model predictions are observed and limits are placed on parameters used to describe anomalous triple and quartic gauge-boson couplings. © 2016 CERN, for 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_24700010_v93_n11_p_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 production of Z bosons with one or two isolated high-energy photons is studied using pp collisions at s=8 TeV. The analyses use a data sample with an integrated luminosity of 20.3 fb-1 collected by the ATLAS detector during the 2012 LHC data taking. The Zγ and Zγγ production cross sections are measured with leptonic (e+e-, μ+μ-, νν) decays of the Z boson, in extended fiducial regions defined in terms of the lepton and photon acceptance. They are then compared to cross-section predictions from the Standard Model, where the sources of the photons are radiation off initial-state quarks and radiative Z-boson decay to charged leptons, and from fragmentation of final-state quarks and gluons into photons. The yields of events with photon transverse energy ET>250 GeV from +-γ events and with ET>400 GeV from ννγ events are used to search for anomalous triple gauge-boson couplings ZZγ and Zγγ. The yields of events with diphoton invariant mass mγγ>200 GeV from +-γγ events and with mγγ>300 GeV from ννγγ events are used to search for anomalous quartic gauge-boson couplings ZZγγ and Zγγγ. No deviations from Standard Model predictions are observed and limits are placed on parameters used to describe anomalous triple and quartic gauge-boson couplings. © 2016 CERN, for the ATLAS Collaboration.
format JOUR
author Aad, G.
spellingShingle Aad, G.
Measurements of Zγ and Zγγ production in pp collisions at s =8 TeV with the ATLAS detector
author_facet Aad, G.
author_sort Aad, G.
title Measurements of Zγ and Zγγ production in pp collisions at s =8 TeV with the ATLAS detector
title_short Measurements of Zγ and Zγγ production in pp collisions at s =8 TeV with the ATLAS detector
title_full Measurements of Zγ and Zγγ production in pp collisions at s =8 TeV with the ATLAS detector
title_fullStr Measurements of Zγ and Zγγ production in pp collisions at s =8 TeV with the ATLAS detector
title_full_unstemmed Measurements of Zγ and Zγγ production in pp collisions at s =8 TeV with the ATLAS detector
title_sort measurements of zγ and zγγ production in pp collisions at s =8 tev with the atlas detector
url http://hdl.handle.net/20.500.12110/paper_24700010_v93_n11_p_Aad
work_keys_str_mv AT aadg measurementsofzgandzngproductioninppcollisionsats8tevwiththeatlasdetector
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