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

TL;DR

This paper reports a search for rare Higgs and Z boson decays into a meson and a photon using ATLAS data, setting upper limits on their branching fractions and testing Standard Model predictions.

Contribution

It provides the first experimental upper limits on Higgs and Z boson decays to mesons plus a photon, probing light-quark couplings.

Findings

No significant excess observed above background.

Set upper limits on Higgs decay branching fractions to $ o ext{meson}\gamma$.

Set upper limits on Z boson decay branching fractions to $ o ext{meson}\gamma$.

Abstract

A search for the exclusive decays of the Higgs and $Z$ bosons to a $\phi$ or $\rho$ 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 $\phi\gamma$ and $\rho\gamma$ of $5.0\times10^{-4}$ and $10.4\times10^{-4}$, respectively. The corresponding 95$\% $ confidence level upper limits for the $Z$ boson decays are $0.7\times10^{-6}$ and $4.0\times10^{-6}$ for $\phi\gamma$ and $\rho\gamma$, respectively.