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

Mullier, Geoffrey; Haug, Sigve; Weber, Michael; Meloni, Federico; Cervelli, Alberto; Beck, Hans Peter; Stucci, Stefania; Ereditato, Antonio (2016). Measurements of ℤγ and ℤγγ production in pp collisions at √s= 8 TeV with the ATLAS detector. Physical review. D - particles, fields, gravitation, and cosmology, D93(11), p. 112002. American Physical Society 10.1103/PhysRevD.93.112002

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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 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 ℓ⁺ℓ⁻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.

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