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Search for the pseudoscalar Higgs boson A0 of the bestest little Higgs model at the LHC and FCC-hh

Y. Cervantes-Baltazar1,*, E. Cruz-Albaro1,†, A. Gutiérrez-Rodríguez1,‡, M. A. Hernández-Ruíz2,§, and D. Espinosa-Gómez3,∥

  • *Contact author: yahiralejandro.708805@fisica.uaz.edu.mx
  • †Contact author: elicruzalbaro88@gmail.com
  • ‡Contact author: alexgu@fisica.uaz.edu.mx
  • §Contact author: mahernan@uaz.edu.mx
  • ∥Contact author: david.espinosa@umich.mx
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Phys. Rev. D 113, 015032 – Published 21 January, 2026

DOI: https://doi.org/10.1103/85b6-2w1t

Abstract

We analyze the sensitivity of the Large Hadron Collider (LHC) and the Future Circular Collider-hadron-hadron (FCC-hh) to the existence of pseudoscalar Higgs boson A0 predicted by the bestest little Higgs model. We study the tree-level (two and three body) and one-loop decays of the pseudoscalar, A0→bb¯,tt¯,γtt¯,γbb¯,Ztt¯,Zbb¯,Wtb¯,h0tt¯,h0bb¯, and A0→γγ,γZ,ZZ,gg,WW, respectively. In addition, we perform a phenomenological study of the production of the pseudoscalar A0 via gluon-fusion gg→A0→Y processes, where Y≡bb¯,tt¯,γγ,γZ,ZZ,gg,WW. From the cross section of the processes of interest and the expected integrated luminosity of the LHC and FCC-hh, we determined the number of events that could be produced in both colliders.

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Phys. Rev. D 113, 015032– Published 21 January, 2026
  • Received 1 July 2025
  • Accepted 2 January 2026
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