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Scientific article
Open access
English

Search for flavour-changing neutral tqH interactions with H → γγ in pp collisions at $ \sqrt{s} $ = 13 TeV using the ATLAS detector

ContributorsATLAS Collaboration
Published inThe journal of high energy physics, vol. 2023, 195
Publication date2023
First online date2023-12-28
Abstract

A search for flavour-changing neutral interactions involving the top quark, the Higgs boson and an up-type quark q (q = c, u) is presented. The proton-proton collision data set used, with an integrated luminosity of 139 fb$^{−1}$, was collected at $ \sqrt{s} $ = 13 TeV by the ATLAS experiment at the Large Hadron Collider. Both the decay process t → qH in $ t\overline{t} $ production and the production process pp → tH, with the Higgs boson decaying into two photons, are investigated. No significant excess is observed and upper limits are set on the t → cH and the t → uH branching ratios of 4.3 × 10$^{−4}$ and 3.8 × 10$^{−4}$, respectively, at the 95% confidence level, while the expected limits in the absence of signal are 4.7 × 10$^{−4}$ and 3.9 × 10$^{−4}$. Combining this search with ATLAS searches in the H → τ$^{+}$τ$^{−}$ and H → $ b\overline{b} $ final states yields observed (expected) upper limits on the t → cH branching ratio of 5.8 × 10$^{−4}$ (3.0 × 10$^{−4}$) at the 95% confidence level. The corresponding observed (expected) upper limit on the t → uH branching ratio is 4.0 × 10$^{−4}$ (2.4 × 10$^{−4}$).

eng
Keywords
  • Flavour Changing Neutral Currents
  • Hadron-Hadron Scattering
  • Higgs Physics
  • Top Physics
  • P p: scattering
  • P p: colliding beams
  • ATLAS
  • Higgs particle: associated production
  • Top: associated production
  • Neutral current: flavor changing
  • Higgs particle: radiative decay
  • Photon: pair production
  • Mass spectrum: two-photon
  • Mass spectrum: (2photon)
  • Top: decay modes
  • Top: branching ratio
  • Branching ratio: upper limit
  • CERN LHC Coll
  • Experimental results
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Search for flavour-changing neutral tqH interactions with H → γγ in pp collisions at $ \sqrt{s} $ = 13 TeV using the ATLAS detector. In: The journal of high energy physics, 2023, vol. 2023, p. 195. doi: 10.1007/jhep12(2023)195
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Article (Published version)
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ISSN of the journal1029-8479
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