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Search for exotic decays of the Higgs boson to a pair of pseudoscalars in the μμbb and ττbb final statesHayrapetyan, A.Tumasyan, A.Adam, W.Andrejkovic, J.W.Bergauer, T.Chatterjee, S.Damanakis, K.Dragicevic, M.Del Valle, A. EscalanteHussain, P.S.Jeitler, M.Krammer, N.Liko, D.Mikulec, I.Schieck, J.Schöfbeck, R.Schwarz, D.Sonawane, M.Templ, S.Waltenberger, W.Wulz, C.-E.Darwish, M.R.Janssen, T.Van Mechelen, P.Bols, E.S.D’Hondt, J.Dansana, S.De Moor, A.Delcourt, M.El Faham, H.Lowette, S.Makarenko, I.Müller, D.Sahasransu, A.R.Tavernier, S.Tytgat, M.Van Putte, S.Vannerom, D.Clerbaux, B.De Lentdecker, G.Favart, L.Hohov, D.Jaramillo, J.Khalilzadeh, A.Lee, K.Mahdavikhorrami, M.Malara, A.Paredes, S.Pétré, L.Postiau, N.BosonsCharged particlesTellurium compoundsVanadium compoundsBranching fractionsConfidence levelsData sampleExotic decayFinal stateHiggs bosonIntegrated luminosityProton proton collisionsPseudoscalarsUpper limitsScattering parametersA search for exotic decays of the Higgs boson (H) with a mass of 125GeV to a pair of light pseudoscalars a1 is performed in final states where one pseudoscalar decays to two b quarks and the other to a pair of muons or τ leptons. A data sample of proton–proton collisions at s=13TeV corresponding to an integrated luminosity of 138fb-1 recorded with the CMS detector is analyzed. No statistically significant excess is observed over the standard model backgrounds. Upper limits are set at 95% confidence level (CL) on the Higgs boson branching fraction to μμbb and to ττbb, via a pair of a1s. The limits depend on the pseudoscalar mass ma1 and are observed to be in the range (0.17–3.3) ×10-4 and (1.7–7.7) ×10-2 in the μμbb and ττbb final states, respectively. In the framework of models with two Higgs doublets and a complex scalar singlet (2HDM+S), the results of the two final states are combined to determine upper limits on the branching fraction B(H→a1a1→ℓℓbb) at 95% CL, with ℓ being a muon or a τ lepton. For different types of 2HDM+S, upper bounds on the branching fraction B(H→a1a1) are extracted from the combination of the two channels. In most of the Type II 2HDM+S parameter space, B(H→a1a1) values above 0.23 are excluded at 95% CL for ma1 values between 15 and 60GeV. © The Author(s) 2024.Springer Nature2024Articlehttps://rdlopen.rawdatalibrary.net/r/ebyu/11971https://doi.org/10.1140/epjc/s10052-024-12727-41434-6044enEuropean Physical Journal Cinfo:eu-repo/semantics/openAccessinfo:eu-repo/semantics/articlehttps://ebyu-rdlopen.rawdatalibrary.net/tr/items/ebyu/11971