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@ARTICLE{Chekhovsky:637078,
      author       = {Chekhovsky, Vladimir and others},
      collaboration = {{CMS Collaboration}},
      title        = {{S}earch for light pseudoscalar boson pairs produced from
                      {H}iggs boson decays using the 4$τ$ and 2$μ$2$τ$ final
                      states in proton-proton collisions at $\sqrt{s}$ = 13
                      {T}e{V}},
      reportid     = {PUBDB-2025-03767, arXiv:2508.06947. CMS-SUS-24-002.
                      CERN-EP-2025-129},
      year         = {2025},
      note         = {Submitted to the Journal of High Energy Physics. All
                      figures and tables can be found at
                      http://cms-results.web.cern.ch/cms-results/public-results/publications/SUS-24-002
                      (CMS Public Pages)},
      abstract     = {A search for a pair of light pseudoscalar bosons (a$_1$)
                      produced in the decay of the 125 GeV Higgs boson is
                      presented. The analysis examines decay modes where one a$_1$
                      decays into a pair of tau leptons and the other decays into
                      either another pair of tau leptons or a pair of muons. The
                      a$_1$ boson mass probed in this study ranges from 4 to 15
                      GeV. The data sample was recorded by the CMS experiment in
                      proton-proton collisions at a center-of-mass energy of 13
                      TeV and corresponds to an integrated luminosity of 138
                      fb$^{-1}$. No excess above standard model (SM) expectations
                      is observed. The study combines the 4$τ$ and 2$μ$2$τ$
                      channels to set upper limits at 95\% confidence level (CL)
                      on the product of the Higgs boson production cross section
                      and the branching fraction to the 4$τ$ final state,
                      relative to the Higgs boson production cross section
                      predicted by the SM. In this interpretation, the a$_1$ boson
                      is assumed to have Yukawa-like couplings to fermions, with
                      coupling strengths proportional to the respective fermion
                      masses. The observed (expected) upper limits range between
                      0.007 (0.011) and 0.079 (0.066) across the mass range
                      considered. The results are also interpreted in the context
                      of models with two Higgs doublets and an additional complex
                      singlet field (2HD+S). The tightest constraints are obtained
                      for the Type III 2HD+S model. In this case, assuming the
                      Higgs boson production cross section equals the SM
                      prediction, values of the branching ratio for the Higgs
                      boson decay into a pair of a$_1$ bosons exceeding 16\% are
                      excluded at 95\% CL for a$_1$ boson masses between 5 and 15
                      GeV and $\tanβ$ $\gt$ 2, with the exception of scenarios in
                      which the a$_1$ boson mixes with charm or bottom
                      quark-antiquark bound states.},
      cin          = {CMS},
      cid          = {I:(DE-H253)CMS-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611) /
                      HIDSS-0002 - DASHH: Data Science in Hamburg - Helmholtz
                      Graduate School for the Structure of Matter
                      $(2019_IVF-HIDSS-0002)$ / DFG project G:(GEPRIS)390833306 -
                      EXC 2121: Quantum Universe (390833306)},
      pid          = {G:(DE-HGF)POF4-611 / $G:(DE-HGF)2019_IVF-HIDSS-0002$ /
                      G:(GEPRIS)390833306},
      experiment   = {EXP:(DE-H253)LHC-Exp-CMS-20150101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2508.06947},
      howpublished = {arXiv:2508.06947},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2508.06947;\%\%$},
      doi          = {10.3204/PUBDB-2025-03767},
      url          = {https://bib-pubdb1.desy.de/record/637078},
}