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Scientific article
Open access
English

Searches for the Z γ decay mode of the Higgs boson and for new high-mass resonances in pp collisions at √s = 13 TeV with the ATLAS detector

ContributorsATLAS Collaboration
Published inJournal of High Energy Physics, vol. 1710, p. 112-163
Collection
  • Open Access - SCOAP3
Publication date2017
Abstract

This article presents searches for the Zγ decay of the Higgs boson and for narrow high-mass resonances decaying to Z γ, exploiting Z boson decays to pairs of electrons or muons. The data analysis uses 36.1 fb −1 of pp collisions at s = 13 $$ \sqrt{s}=13 $$ 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 → H → Z γ production and decay) upper limit on the production cross section times the branching ratio for pp → H → Z γ 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.

Keywords
  • Hadron-Hadron scattering (experiments)
  • Higgs physics
Citation (ISO format)
ATLAS Collaboration. Searches for the Z γ decay mode of the Higgs boson and for new high-mass resonances in pp collisions at √s = 13 TeV with the ATLAS detector. In: Journal of High Energy Physics, 2017, vol. 1710, p. 112–163. doi: 10.1007/JHEP10(2017)112
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Article (Published version)
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ISSN of the journal1029-8479
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