ATLAS Collaboration (Including: Ennis, Joseph Stanford, Farrington, Sinead, Harrison, P. F., Jelinskas, Adomas, Martin, T. A., McNicol, Christopher John, Murray, W., Pianori, E., Spangenberg, Martin and Xia, Ligang). (2018) Searches for exclusive Higgs and Z boson decays into J/ψ γ, ψ(2S) γ, and ϒ(nS) γ at s=13TeV with the ATLAS detector. Physics Letters B, 786 . pp. 134-155. doi:10.1016/j.physletb.2018.09.024 ISSN 0370-2693.

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Abstract

Searches for the exclusive decays of the Higgs and Z bosons into a J/ψ, ψ(2S), or ϒ(nS) (n=1,2,3) meson and a photon are performed with a pp collision data sample corresponding to an integrated luminosity of 36.1fb−1 collected at s=13TeV with the ATLAS detector at the CERN Large Hadron Collider. No significant excess of events is observed above the expected backgrounds, and 95% confidence-level upper limits on the branching fractions of the Higgs boson decays to J/ψγ, ψ(2S)γ, and ϒ(nS)γ of 3.5×10−4, 2.0×10−3, and (4.9,5.9,5.7)×10−4, respectively, are obtained assuming Standard Model production. The corresponding 95% confidence-level upper limits for the branching fractions of the Z boson decays are 2.3×10−6, 4.5×10−6 and (2.8,1.7,4.8)×10−6, respectively.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
SWORD Depositor:	Library Publications Router
Library of Congress Subject Headings (LCSH):	Higgs bosons, Z bosons, Mesons, Photons
Journal or Publication Title:	Physics Letters B
Publisher:	Elsevier
ISSN:	0370-2693
Official Date:	10 November 2018
Dates:	Date Event 10 November 2018 Published
Volume:	786
Page Range:	pp. 134-155
DOI:	10.1016/j.physletb.2018.09.024
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
Date of first compliant deposit:	22 June 2018
Date of first compliant Open Access:	22 June 2018
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