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.

6 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/

References in corpus (14)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• PYTHIA 6.4 Physics and Manual
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• Electron and photon energy calibration with the ATLAS detector using LHC Run 1 data
• Measurement of the muon reconstruction performance of the ATLAS detector using 2011 and 2012 LHC proton-proton collision data
• General Minimal Flavor Violation
• Higgs-dependent Yukawa couplings
• An Exclusive Window onto Higgs Yukawa Couplings
• Relativistic corrections to Higgs boson decays to quarkonia
• Real next-to-next-to-leading-order QCD corrections to J/psi and Upsilon hadroproduction in association with a photon
• Internal conversions in Higgs decays to two photons
• Angular distribution and forward-backward asymmetry of the Higgs-boson decay to photon and lepton pair
• Probing New Physics in Higgs Couplings to Fermions using an Angular Analysis

Cited by in corpus (8)

• Physics at a 100 TeV pp collider: Higgs and EW symmetry breaking studies
• Associated production of a quarkonium and a Z boson at one loop in a quark-hadron-duality approach
• Phenomenology of Enhanced Light Quark Yukawa Couplings and the $W^{\pm }h$ Charge Asymmetry
• Search for Higgs and $Z$ Boson Decays to $\varphi \gamma$ with the ATLAS Detector
• Higgs Boson Decay to Light Jets at the LHC
• Exclusive Weak Radiative Higgs Decays in the Standard Model and Beyond
• Double-charming Higgs identification using machine-learning assisted jet shapes
• Yukawas and trilinear Higgs terms from loops