Search for exclusive Higgs and $Z$ boson decays to $\phi\gamma$ and $\rho\gamma$ with the ATLAS detector

Philip James Clark, Sinead Farrington, Michele Faucci Giannelli, Yanyan Gao, Ahmed Hasib, Christos Leonidopoulos, Victoria Jane Martin, Liza Mijović, Corrinne Mills, Benjamin Wynne, Atlas Collaboration

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

A search for the exclusive decays of the Higgs and Z bosons to a ϕ or ρ meson and a photon is performed with a pp collision data sample corresponding to an integrated luminosity of up to 35.6 fb$^{−1}$ collected at $ \sqrt{s}=13 $ TeV with the ATLAS detector at the CERN Large Hadron Collider. These decays have been suggested as a probe of the Higgs boson couplings to light quarks. No significant excess of events is observed above the background, as expected from the Standard Model. Upper limits at 95% confidence level were obtained on the branching fractions of the Higgs boson decays to ϕγ and ργ of 4.8 × 10$^{−4}$ and 8.8 × 10$^{−4}$, respectively. The corresponding 95% confidence level upper limits for the Z boson decays are 0.9 × 10$^{−6}$ and 25 × 10$^{−6}$ for ϕγ and ργ, respectively.
Original languageEnglish
Article number127
Journal Journal of High Energy Physics
Publication statusPublished - 19 Jul 2018


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