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This paper describes a search for dark photons ($\gamma_d$) in proton-protoncollisions at $\sqrt{s}=13$ TeV at the Large Hadron Collider (LHC). The darkphotons are searched for in the decay of Higgs bosons ($H \to \gamma\gamma_d$)produced through the $ZH$ production mode. The transverse mass of the system,made of the photon and the missing transverse momentum from the non-interacting$\gamma_d$, presents a distinctive signature as it peaks near the Higgs bosonmass. The results presented use the total Run-2 integrated luminosity of 139fb$^{-1}$ recorded by the ATLAS detector at the LHC. The dominant reduciblebackground processes are estimated using data-driven techniques. A BoostedDecision Tree technique is adopted to enhance the sensitivity of the search. Asno excess is observed with respect to the Standard Model prediction, anobserved (expected) upper limit on the branching ratio BR$(H\to\gamma\gamma_d)$ of 2.28$\%$ (2.82$^{+1.33}_{-0.84}\%$) is set at 95$\%$ CL formassless $\gamma_d$. For massive dark photons up to 40 GeV, the observed(expected) upper limits on BR$(H\to \gamma\gamma_d)$ at 95\% confidence levelis found within the [2.19,2.52]$\%$ ([2.71,3.11]$\%$) range.

cornell university

Search for dark photons from Higgs boson decays via $ZH$ production with  a photon plus missing transverse momentum signature from $pp$ collisions at  $\sqrt{s}$ = 13 TeV with the ATLAS detector