Search for Higgs and $Z$ Boson Decays to $\varphi \gamma$ with the ATLAS Detector

Abstract

A search for the decays of the Higgs and $Z$ bosons to a $\varphi$ meson and a photon is performed with a $pp$ collision data sample corresponding to an integrated luminosity of 2.7 fb${}^{-1}$ collected at $\sqrt{s}=$13 TeV with the ATLAS detector at the LHC. No significant excess of events is observed above the background, and 95% confidence level upper limits on the branching fractions of the Higgs and $Z$ boson decays to $\varphi \gamma$ of 1.4$\times$10${}^{-3}$ and 8.3$\times$10${}^{-6}$, respectively, are obtained.

27 pages total, author list starting page 11, 3 figures, 2 tables. Published in Phys. Rev. Lett. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2016-05/

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• Searches for exclusive Higgs and $Z$ boson decays into a vector quarkonium state and a photon using $139$ fb${}^{-1}$ of ATLAS $\sqrt{s}=13$ TeV proton$-$proton collision data
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• Search for the rare decays $W^{+}\to D_s^{+}\gamma$ and $Z\to D^0\gamma$ at LHCb
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• Exclusive rare Higgs decays into lepton pair and light mesons
• Mass biases in reconstructing exclusive radiative hadronic decays of W bosons at the LHC