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Type: Journal article
Title: Measurements of Zγ and Zγγ production in pp collisions at √s =8 TeV with the ATLAS detector
Other Titles: Measurements of Zgamma and Zgamma gamma production in pp collisions at root s =8 TeV with the ATLAS detector
Author: Aad, G.
ATLAS Collaboration
Abbott, B.
Abdallah, J.
Abdinov, O.
Abeloos, B.
Aben, R.
Abolins, M.
Abouzeid, O.
Abraham, N.
Abramowicz, H.
Abreu, H.
Abreu, R.
Abulaiti, Y.
Acharya, B.
Adamczyk, L.
Adams, D.
Adelman, J.
Adomeit, S.
Adye, T.
et al.
Citation: Physical Review D - Particles, Fields, Gravitation, and Cosmology, 2016; 93(11):112002-1-112002-41
Publisher: American Physical Society
Issue Date: 2016
ISSN: 1550-7998
Statement of
G. Aad ...P. Jackson ... L. Lee ... A. Petridis ... M. J. White ... et al. (ATLAS Collaboration)
Abstract: 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  GeV from 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¯γγ 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.
Description: Published 2 June 2016
Rights: © 2016 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License.
RMID: 0030051951
DOI: 10.1103/PhysRevD.93.112002
Appears in Collections:Physics publications

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