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Searches for the $Z\gamma$ decay mode of the Higgs boson and for new high-mass resonances in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector

The ATLAS collaboration
JHEP 1710 (2017) 112, 2017

Abstract (data abstract)
CERN-LHC. The resuts of searches for the Zγ decay of the Higgs boson and for narrow high-mass resonances decaying to Zγ, exploiting Z boson decays to pairs of electrons or muons are presented. The data analysis uses 36.1 fb$^{−1}$ of pp collisions at $\sqrt{s}=13$ TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. The data are found to be consistent with the expected Standard Model background. The observed (expected - assuming Standard Model $pp\rightarrow H\rightarrow Z\gamma$ production and decay) upper limit on the production cross section times the branching ratio for $pp\rightarrow H\rightarrow Z\gamma$ is 6.6 (5.2) times the Standard Model prediction at the 95\% confidence level for a Higgs boson mass of 125.09 GeV. In addition, upper limits are set on the production cross section times the branching ratio as a function of the mass of a narrow resonance between 250 GeV and 2.4 TeV, assuming spin-0 resonances produced via gluon-gluon fusion, and spin-2 resonances produced via gluon-gluon or quark-antiquark initial states. For high-mass spin-0 resonances, the observed (expected) limits vary between 88 fb (61 fb) and 2.8 fb (2.7 fb) for the mass range from 250 GeV to 2.4 TeV at the 95% confidence level.

  • Table 1

    Data from Figure 7 on page 26 of the Preprint

    10.17182/hepdata.78906.v1/t1

    The measured sigma(pp-->X)xB(X->Z gamma) limit with the hypothesis of spin-0 resonance.

  • Table 2

    Data from Figure 8a on page 26 of the Preprint

    10.17182/hepdata.78906.v1/t2

    The measured sigma(pp-->X)xB(X->Z gamma) limit with the hypothesis of spin-2 resonance via gluon-gluon initial states.

  • Table 3

    Data from Figure 8b on page 26 of the Preprint

    10.17182/hepdata.78906.v1/t3

    The measured sigma(pp-->X)xB(X->Z gamma) limit with the hypothesis of spin-0 resonance via qqbar initial states.

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