An inclusive search is presented for spin-zero bosons decaying to ττ in a previously unexplored mass range between 20 and 60 GeV using proton-proton collision data at s = 13. 6 TeV, corresponding to an integrated luminosity of 61. 9 fb^-1 recorded by CMS in 2022-2023. A high-rate trigger stream in combination with a novel low-momentum hadronic tau reconstruction algorithm have enabled a measurement of the Υ (1S, 2S, 3S) τ^+τ^- process in the challenging environment of a hadron collider, with a 5. 8σ significance above background and production cross section of 3. 5 0. 7 (stat) 0. 7 (syst) nb for visible rapidity yₕ₈ₒ 1. 2 and visible transverse momentum pTᵛis 15 GeV. No significant excess above the standard model background is observed. Upper limits on the product of the spin-zero resonance production cross section and branching fraction to ττ are set at 95% confidence level between 40 and 400 pb.
Hayrapetyan et al. (2026) studied this question.