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A bstract Three searches are presented for signatures of physics beyond the standard model (SM) in ττ final states in proton-proton collisions at the LHC, using a data sample collected with the CMS detector at s s = 13 TeV, corresponding to an integrated luminosity of 138 fb − 1. Upper limits at 95% confidence level (CL) are set on the products of the branching fraction for the decay into τ leptons and the cross sections for the production of a new boson ϕ, in addition to the H (125) boson, via gluon fusion (gg ϕ) or in association with b quarks, ranging from O O (10 pb) for a mass of 60 GeV to 0. 3 fb for a mass of 3. 5 TeV each. The data reveal two excesses for gg ϕ production with local p -values equivalent to about three standard deviations at m ϕ = 0. 1 and 1. 2 TeV. In a search for t -channel exchange of a vector leptoquark U 1, 95% CL upper limits are set on the dimensionless U 1 leptoquark coupling to quarks and τ leptons ranging from 1 for a mass of 1 TeV to 6 for a mass of 5 TeV, depending on the scenario. In the interpretations of the M₇^125 M h 125 and M₇, ₄₅ₓ^125 M h, EFT 125 minimal supersymmetric SM benchmark scenarios, additional Higgs bosons with masses below 350 GeV are excluded at 95% CL.
Tumasyan et al. (Mon,) studied this question.