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Scientific article
Open access
English

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

ContributorsATLAS Collaboration
Published inThe journal of high energy physics, vol. 2023, no. 7, 133
Publication date2023
First online date2023-07-17
Abstract

This paper describes a search for dark photons ( γ d ) in proton-proton collisions at $$ \sqrt{s} $$ s = 13 TeV at the Large Hadron Collider (LHC). The dark photons are searched for in the decay of Higgs bosons ( H → γγ 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 γ d , presents a distinctive signature as it peaks near the Higgs boson mass. The results presented use the total Run-2 integrated luminosity of 139 fb − 1 recorded by the ATLAS detector at the LHC. The dominant reducible background processes are estimated using data-driven techniques. A Boosted Decision Tree technique is adopted to enhance the sensitivity of the search. As no excess is observed with respect to the Standard Model prediction, an observed (expected) upper limit on the branching ratio BR( H → γγ d ) of 2.28% ( $$ {2.82}_{-0.84}^{+1.33}\% $$ 2.82 − 0.84 + 1.33 % ) is set at 95% CL for massless γ d . For massive dark photons up to 40 GeV, the observed (expected) upper limits on BR( H → γγ d ) at 95% confidence level is found within the [2.19,2.52]% ([2.71,3.11]%) range.

eng
Keywords
  • Hadron-Hadron Scattering
  • P p: colliding beams
  • Transverse momentum: missing-energy
  • P p: scattering
  • Higgs particle: associated production
  • Z0: associated production
  • Higgs particle: radiative decay
  • Higgs particle: rare decay
  • Decay: exotic
  • Mass: transverse
  • Higgs particle: mass
  • Photon: hidden sector
  • CERN LHC Coll
  • Signature
  • ATLAS
  • Higgs particle: branching ratio: upper limit
  • Photon: mass
  • Sensitivity
  • Background
  • Data analysis method
  • Experimental results
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Search for dark photons from Higgs boson decays via <i>ZH </i>production with a photon plus missing transverse momentum signature from <i>pp</i> collisions at <i>\sqrt{s} </i>= 13 TeV with the ATLAS detector. In: The journal of high energy physics, 2023, vol. 2023, n° 7, p. 133. doi: 10.1007/jhep07(2023)133
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ISSN of the journal1029-8479
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