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

TL;DR

This paper reports a search for Higgs and Z boson decays to a phi meson and a photon using ATLAS data, setting upper limits on their branching fractions due to no significant excess observed.

Contribution

First search for Higgs and Z decays to phi gamma with ATLAS, establishing upper limits on their branching fractions at 13 TeV.

Findings

No significant excess observed above background.

Upper limit on Higgs to phi gamma branching fraction: 1.4×10^{-3}.

Upper limit on Z to phi gamma branching fraction: 8.3×10^{-6}.

Abstract

A search for the decays of the Higgs and $Z$ bosons to a $\phi$ 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 $\phi\,\gamma$ of 1.4$\times$10$^{-3}$ and 8.3$\times$10$^{-6}$, respectively, are obtained.