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A search for the $Z\gamma$ decay mode of the Higgs boson in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector

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arxiv 2005.05382 v2 pith:X6IFCOBY submitted 2020-05-11 hep-ex

classification hep-ex
keywords bosongammahiggsmodelstandardtimesatlasdata
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

A search for the $Z\gamma$ decay of the Higgs boson, with $Z$ boson decays into pairs of electrons or muons is presented. The analysis uses proton$-$proton collision data at $\sqrt{s}$ = 13 TeV corresponding to an integrated luminosity of 139 fb$^{-1}$ recorded by the ATLAS detector at the Large Hadron Collider. The observed data are consistent with the expected background with a $p$-value of 1.3%. An upper limit at 95% confidence level on the production cross-section times the branching ratio for $pp\to H\to Z\gamma$ is set at 3.6 times the Standard Model prediction while 2.6 times is expected in the presence of the Standard Model Higgs boson. The best-fit value for the signal yield normalised to the Standard Model prediction is $2.0^{+1.0}_{-0.9}$ where the statistical component of the uncertainty is dominant.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Measurement of the Higgs boson decay to a low-mass dilepton system and a photon in $pp$ collisions at $\sqrt{s} =$ 13 and 13.6 TeV with the ATLAS detector

    hep-ex 2026-08 accept novelty 5.0 of 10

    Combined Run-2+Run-3 ATLAS measurement of H to ell ell gamma (m_ll < 30 GeV) gives mu = 1.03 (+0.35/-0.32) with 3.4 sigma observed (3.3 sigma expected) significance, consistent with the Standard Model.

  2. The Higgs boson through the lens of electroweak precision data

    hep-ph 2026-07 accept novelty 5.0 of 10

    Updated Gfitter EW fit with new MW average yields SM-consistent indirect observables and, via kappa_V from oblique parameters plus LHC signal strengths, determines Gamma_H to ~10% precision under leading-log assumptions.

  3. Search for the Higgs boson decay to a $Z$ boson and a photon in $pp$ collisions at $\sqrt{s}=13$ TeV and $13.6$ TeV with the ATLAS detector

    hep-ex 2025-07 accept novelty 4.0 of 10

    ATLAS measures the Higgs to Z and photon signal yield as 1.3 +0.6 -0.5 times the Standard Model prediction in the combined 305 inverse femtobarn dataset, with 2.5 sigma observed significance.

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