Search for decays of the Higgs boson into pair-produced pseudoscalar particles decaying into $τ^+τ^-τ^+τ^-$ using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
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arXiv
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866917324774178816 |
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| author | ATLAS Collaboration |
| author_facet | ATLAS Collaboration |
| contents | A search for a pair of low-mass pseudoscalars $a$ that promptly decay into $τ$-leptons is presented using 140 fb$^{-1}$ of proton-proton collision data at $13$ TeV centre-of-mass energy recorded with the ATLAS detector at the Large Hadron Collider. The result is used to place constraints on exotic decays of the Higgs boson into four $τ$-leptons, $H\to aa\to τ^+τ^-τ^+τ^-$. This search focuses on events with either one or two $τ$-leptons decaying into hadrons and neutrinos, and the remaining three or two $τ$-leptons decaying into either electron or muon and neutrinos. No significant excess is observed above the expected Standard Model background and upper limits at the 95% confidence level on $\mathcal{B}(H\rightarrow aa\rightarrow τ^+τ^-τ^+τ^-)$ are set ranging from 0.06 to 0.23, depending on the mass $m_a$ ranging from 15 to 60 GeV. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_08323 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Search for decays of the Higgs boson into pair-produced pseudoscalar particles decaying into $τ^+τ^-τ^+τ^-$ using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector ATLAS Collaboration High Energy Physics - Experiment A search for a pair of low-mass pseudoscalars $a$ that promptly decay into $τ$-leptons is presented using 140 fb$^{-1}$ of proton-proton collision data at $13$ TeV centre-of-mass energy recorded with the ATLAS detector at the Large Hadron Collider. The result is used to place constraints on exotic decays of the Higgs boson into four $τ$-leptons, $H\to aa\to τ^+τ^-τ^+τ^-$. This search focuses on events with either one or two $τ$-leptons decaying into hadrons and neutrinos, and the remaining three or two $τ$-leptons decaying into either electron or muon and neutrinos. No significant excess is observed above the expected Standard Model background and upper limits at the 95% confidence level on $\mathcal{B}(H\rightarrow aa\rightarrow τ^+τ^-τ^+τ^-)$ are set ranging from 0.06 to 0.23, depending on the mass $m_a$ ranging from 15 to 60 GeV. |
| title | Search for decays of the Higgs boson into pair-produced pseudoscalar particles decaying into $τ^+τ^-τ^+τ^-$ using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2603.08323 |