Collaboration, ATLAS
(2016)
Measurements of $Zγ$ and $Zγγ$ production in $pp$ collisions at $\sqrt{s}=$ 8 TeV with the ATLAS detector
Phys. Rev. D, 93.
112002-.
Abstract
The production of $Z$ bosons with one or two isolated high-energy photons is studied using $pp$ collisions at $\sqrt{s}$ = 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 ($e^{+}e^{-}$, $μ^{+}μ^{-}$, $ν\barν$) 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 $E_T >$ 250 GeV from $\ell^{+}\ell^{-}γ$ events and with $E_T >$ 400 GeV from $ν\barνγ$ events are used to search for anomalous triple gauge-boson couplings $ZZγ$ and $Zγγ$. The yields of events with diphoton invariant mass $m_{γγ} >$ 200 GeV from $\ell^{+}\ell^{-}γγ$ events and with $m_{γγ} > $ 300 GeV from $ν\barνγγ$ 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.
| Item Type: | Article |
|---|---|
| Additional Information: | 41 pages plus author list + cover pages (59 pages total), 17 figures, 13 tables, submitted to Physical Review D, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2014-01/ |
| Uncontrolled Keywords: | hep-ex, hep-ex |
| Divisions: | Faculty of Science & Engineering > School of Physical Sciences |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 16 Feb 2024 09:07 |
| Last Modified: | 22 Apr 2026 10:57 |
| Open Access URL: | https://journals.aps.org/prd/abstract/10.1103/Phys... |
| Related Websites: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3178706 |
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