ATLAS Collaboration (Including: Beckingham, M., Ennis, Joseph Stanford, Farrington, Sinead, Harrison, P. F., Jelinskas, Adomas, Jeske, C., Martin, T. A., Murray, W., Pianori, E. and Spangenberg, Martin). (2017) Searches for the Zγ decay mode of the Higgs boson and for new high-mass resonances in pp collisions at s=13 TeV with the ATLAS detector. Journal of High Energy Physics, 2017 (10). 112. doi:10.1007/jhep10(2017)112

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Abstract

AbstractThis article presents 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. The data analysis uses 36.1 fb−1 of pp collisions at 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 → Zγ production and decay) upper limit on the production cross section times the branching ratio for pp → H → Zγ 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.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
SWORD Depositor:	Library Publications Router
Library of Congress Subject Headings (LCSH):	Particles (Nuclear physics), Higgs bosons, Nuclear physics, Scattering (Physics), Hadrons — Scattering
Journal or Publication Title:	Journal of High Energy Physics
Publisher:	Springer
ISSN:	1029-8479
Official Date:	17 October 2017
Dates:	Date Event 17 October 2017 Published 18 September 2017 Accepted
Volume:	2017
Number:	10
Article Number:	112
DOI:	10.1007/jhep10(2017)112
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access
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