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

Barton, Adam Edward and Beattie, Michael and Bertram, Iain Alexander and Borissov, Guennadi and Bouhova-Thacker, Evelina Vassileva and Cheatham, Sue and Dearnaley, William and Fox, Harald and Grimm, Kathryn Ann Tschann and Henderson, Robert Charles William and Hughes, Gareth and Jones, Roger William Lewis and Kartvelishvili, Vakhtang and Long, Robin Eamonn and Love, Peter Allan and Muenstermann, Daniel Matthias Alfred and Parker, Adam Jackson and Skinner, Malcolm and Smizanska, Maria and Walder, James William and Wharton, Andy (2016) Measurements of Zγ and Zγγ production in pp collisions at √s=8 TeV with the ATLAS detector. Physical Review D, 93 (11). ISSN 1550-7998

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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 ℓ+ℓ−γ events and with ET>400  GeVfrom νν¯γ 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 ℓ+ℓ−γγ events and with mγγ>300  GeV from νν¯γγevents are used to search for anomalous quartic gauge-boson couplings ZZγγand 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.

Item Type: Journal Article
Journal or Publication Title: Physical Review D
Departments: Faculty of Science and Technology > Physics
ID Code: 80834
Deposited By: ep_importer_pure
Deposited On: 09 Aug 2016 11:20
Refereed?: Yes
Published?: Published
Last Modified: 15 Oct 2019 03:49

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