Search for Higgs and $Z$ Boson Decays to $J/\psi \gamma$ and ${\rm Y}(nS)\gamma$ with the ATLAS Detector

Abstract

A search for the decays of the Higgs and $Z$ bosons to $J/\psi \gamma$ and ${\rm Y}(nS)\gamma$ ($n=1,2,3$) is performed with $pp$ collision data samples corresponding to integrated luminosities of up to $20.3{\mathrm{fb}}^{-1}$ collected at $\sqrt{s}=8\mathrm{TeV}$ with the ATLAS detector at the CERN Large Hadron Collider. No significant excess of events is observed above expected backgrounds and 95\% CL upper limits are placed on the branching fractions. In the $J/\psi \gamma$ final state the limits are $1.5\times 10^{-3}$ and $2.6\times 10^{-6}$ for the Higgs and $Z$ boson decays, respectively, while in the ${\rm Y}(1S,2S,3S)\gamma$ final states the limits are $(1.3,1.9,1.3)\times 10^{-3}$ and $(3.4,6.5,5.4)\times 10^{-6}$, respectively.

arXiv comment6 pages plus author list + cover pages (20 pages total), 2 figures, 2 tables, published version, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2014-03/

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