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

The collaboration
JHEP 12 (2018) 010, 2018.

Abstract (data abstract)
CERN-LHC. 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 in 2015 and 2016. $Z\gamma$ events with invisible decays of the $Z$ boson are selected by requiring significant missing transverse energy ($E_{\mathrm{T}}^{\mathrm{miss}}$) in conjunction with a single isolated photon with large transverse energy ($E_{\mathrm{T}}$). The rate of $Z\gamma$ production is measured as a function of photon $E_{\mathrm{T}}$, $E_{\mathrm{T}}^{\mathrm{miss}}$ and jet multiplicity. Evidence for anomalous triple gauge coupling is sought in $Z\gamma$ production with photon $E_{\mathrm{T}}$ 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. The extended fiducial region is defined as: - ptPhoton > 150 GeV - ptNuNubar > 150 GeV - |etaPhoton| < 2.37 - ptJet > 50 GeV - |etaJet| < 4.5 - min(DeltaR(jet,photon)) > 0.3; - Inclusive selection: Njets>=0; Exclusive selection: Njets=0.

• #### Table 1

Data from Table 6

10.17182/hepdata.83965.v1/t1

Measured integrated cross sections for the $Z\gamma$ process for neutrino final states at $\sqrt{s} = 13$ TeV in the extended...

• #### Table 2

Data from Figure 4a

10.17182/hepdata.83965.v1/t2

Measured differential cross sections for the $pp \rightarrow \nu\bar{\nu}\gamma$ process at $\sqrt{s} = 13$ TeV as a function of photon...

• #### Table 3

Data from Figure 4b

10.17182/hepdata.83965.v1/t3

Measured differential cross sections for the $pp \rightarrow \nu\bar{\nu}\gamma$ process at $\sqrt{s} = 13$ TeV as a function of photon...

• #### Table 4

Data from Figure 5a

10.17182/hepdata.83965.v1/t4

• #### Table 6

Data from Figure 6

10.17182/hepdata.83965.v1/t6

Measured differential cross sections as a function of $N_{jets}$ in the extended fiducial region defined in the paper.

• #### Table 7

Data from Table 8

10.17182/hepdata.83965.v1/t7

Observed and expected one dimensional 95% C.L. limits on vertex function parameters for the $ZZ\gamma$ and $Z\gamma\gamma$ vertices.

• #### Table 8

Data from Table 9

10.17182/hepdata.83965.v1/t8

Observed and expected one dimensional 95% C.L. limits on EFT parameters for the $ZZ\gamma$ and $Z\gamma\gamma$ vertices.

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