Measurement of the $Z\gamma \to \nu \bar{\nu }\gamma$ production cross section in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector and limits on anomalous triple gauge-boson couplings

Abstract

The production of $Z$ bosons in association with a high-energy photon ($Z\gamma$ production) is studied in the neutrino decay channel of the $Z$ boson using $pp$ collisions at $\sqrt{s}$ = 13 TeV. The analysis uses a data sample with an integrated luminosity of 36.1 fb${}^{-1}$ collected by the ATLAS detector at the LHC in 2015 and 2016. Candidate $Z\gamma$ events with invisible decays of the $Z$ boson are selected by requiring significant transverse momentum ($p_T$) of the dineutrino system in conjunction with a single isolated photon with large transverse energy ($E_T$). The rate of $Z\gamma$ production is measured as a function of photon $E_T$, dineutrino system $p_T$ and jet multiplicity. Evidence of anomalous triple gauge-boson couplings is sought in $Z\gamma$ production with photon $E_T$ greater than 600 GeV. No excess is observed relative to the Standard Model expectation, and upper limits are set on the strength of $ZZ\gamma$ and $Z\gamma \gamma$ couplings.

42 pages in total, author list starting page 26, 7 figures, 9 tables, published in JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2017-18/

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• Measurement of the $Z(\to {\ell }^{+}{\ell }^{-})\gamma$ production cross-section in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• The Zγ transverse-momentum spectrum at NNLO+N3LL
• Constraining CP violating operators in charged and neutral triple gauge couplings
• Probing Neutral Triple Gauge Couplings with $Z^{\ast }\gamma (\nu \bar{\nu }\gamma )$ Production at Hadron Colliders
• Anomalous couplings in $Z\gamma$ events at NNLO+PS and improving $\nu \bar{\nu }\gamma$ backgrounds in dark-matter searches
• Custodial Symmetry Breaking and Higgs Signatures at the LHC
• Unitarity Constraints and Collider Searches for Dark Photons
• Electroweak, QCD and flavour physics studies with ATLAS data from Run 2 of the LHC
• Dark Matter from Anomaly Cancellation at the LHC
• Local Baryon Number at the LHC
• Study of constraint and impact of a nuisance parameter in maximum likelihood method
• Search for Neutral Triple Gauge Couplings with $ZZ$ Production at Future Electron Positron Colliders
• Observation of $W^{+}{W}^{-}\gamma$ production in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector and constraints on anomalous quartic gauge-boson couplings
• $CP$-violating effects of the neutral triple gauge couplings in $Z(\ell \ell )\gamma$ production at the LHC
• Probing Neutral Triple Gauge Couplings via $ZZ$ Production at $e^{+}{e}^{-}$ Colliders with Machine Learning
• NNLO QCD predictions of the asymmetry probe of the $Z\gamma$ pair-production process