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<p>Exotic Higgs decays are among the most promising areas to be explored at the High-Luminosity LHC, given the unprecedentedly large amount (~ 3 × 10<sup>8</sup>) of 125 GeV Higgs bosons that will be produced. In this context, we propose a new search channel for which the Higgs boson decays to a (leptonically decaying) <i>Z</i> boson and a light BSM pseudoscalar <i>a</i>, which subsequently decays to a pair of <i>τ</i>-leptons (<i>h</i> → <i>Za</i> → <i>ℓℓττ</i>). After performing a validation of existing ATLAS and CMS exotic Higgs decay searches in related channels, we analyze the HL-LHC projected sensitivity of our <i>a → ττ</i> search, targeting the kinematic region where the exotic Higgs decay is two-body. We are able to probe pseudoscalar masses <i>m</i><sub><i>a</i></sub> ∈ [<CitationRef CitationID="CR5">5</CitationRef><i>,</i> <CitationRef CitationID="CR33">33</CitationRef>] GeV by leveraging both leptonic and hadronic <i>τ</i> decays, and establish model-independent 95% C.L. sensitivity projections on the branching fraction BR(<i>h → Za</i>) × BR(<i>a → ττ</i>). These <i>a → ττ</i> projections yield a competitive probe of light pseudoscalars, which depending on the model can become significantly more sensitive than projections from existing experimental searches in <i>a → μμ</i> and <i>a → γγ</i> final states. Finally, we explore the potential of our search to probe an Axion-Like-Particle (ALP) solution to the muon (<i>g −</i> 2) anomaly (when taken face-value), finding that our proposed <i>h → Za</i>, <i>a → ττ</i> search can provide valuable constraints on such ALP scenario, in complementarity with existing <i>h → Za</i>, <i>a → γγ</i> experimental searches.</p>

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Exotic h → Za Higgs decays into τ leptons

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月1日

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  • M. Cepeda,
  • J. M. No,
  • C. Ramos,
  • R. M. Sandá Seoane,
  • J. Zurita

摘要

Exotic Higgs decays are among the most promising areas to be explored at the High-Luminosity LHC, given the unprecedentedly large amount (~ 3 × 108) of 125 GeV Higgs bosons that will be produced. In this context, we propose a new search channel for which the Higgs boson decays to a (leptonically decaying) Z boson and a light BSM pseudoscalar a, which subsequently decays to a pair of τ-leptons (h → Za → ℓℓττ). After performing a validation of existing ATLAS and CMS exotic Higgs decay searches in related channels, we analyze the HL-LHC projected sensitivity of our a → ττ search, targeting the kinematic region where the exotic Higgs decay is two-body. We are able to probe pseudoscalar masses ma ∈ [5, 33] GeV by leveraging both leptonic and hadronic τ decays, and establish model-independent 95% C.L. sensitivity projections on the branching fraction BR(h → Za) × BR(a → ττ). These a → ττ projections yield a competitive probe of light pseudoscalars, which depending on the model can become significantly more sensitive than projections from existing experimental searches in a → μμ and a → γγ final states. Finally, we explore the potential of our search to probe an Axion-Like-Particle (ALP) solution to the muon (g − 2) anomaly (when taken face-value), finding that our proposed h → Za, a → ττ search can provide valuable constraints on such ALP scenario, in complementarity with existing h → Za, a → γγ experimental searches.