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

(ATLAS Collaboration), K. Cranmer, A. Haas, A. I. Mincer, P. Nemethy

Research output: Contribution to journalArticle

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 +-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.

Original languageEnglish (US)
Article number112002
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume93
Issue number11
DOIs
StatePublished - Jun 2 2016

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bosons
collisions
detectors
photons
leptons
quarks
cross sections
gluons
decay
predictions
acceptability
fragmentation
luminosity
deviation
energy
radiation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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Measurements of Zγ and Zγγ production in pp collisions at s =8 TeV with the ATLAS detector. / (ATLAS Collaboration); Cranmer, K.; Haas, A.; Mincer, A. I.; Nemethy, P.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 93, No. 11, 112002, 02.06.2016.

Research output: Contribution to journalArticle

(ATLAS Collaboration) ; Cranmer, K. ; Haas, A. ; Mincer, A. I. ; Nemethy, P. / Measurements of Zγ and Zγγ production in pp collisions at s =8 TeV with the ATLAS detector. In: Physical Review D - Particles, Fields, Gravitation and Cosmology. 2016 ; Vol. 93, No. 11.
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