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ATLAS Collaboration(Aad, G. et al), Ahuja, S., Aikot, A., Cabrera Urban, S., Cantero, J., Carrion Martinez, C., et al. (2026). Search for decays of the Higgs boson into pair-produced pseudoscalar particles decaying into τ+τ-τ+τ- using pp collisions at √s=13 TeV with the ATLAS detector. New J. Phys., 28(6), 063801–24pp.
Abstract: A search for a pair of low-mass pseudoscalars a that promptly decay into tau-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 tau-leptons, H -> aa -> tau(+)tau(-)tau(+)tau(-). This search focuses on events with either one or two tau-leptons decaying into hadrons and neutrinos, and the remaining three or two tau-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 B(H -> aa -> tau(+)tau(-)tau(+)tau(-)) are set ranging from 0.06 to 0.23, depending on the mass m(a) ranging from 15 to 60 GeV.
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