Compact Muon Solenoid
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| CMS-PAS-B2G-25-004 | ||
| Study of ZZ and ZH production in the $ \mathrm{bb}\tau\tau $ final state and search for high-mass spin-0 and spin-1 resonances | ||
| CMS Collaboration | ||
| 2026-03-11 | ||
| Abstract: A study is presented for the production of pairs of Z bosons (ZZ) and for the associated production of a Z boson and a Higgs boson (H) in final states containing two b quarks and two tau leptons. Both resonant and nonresonant production mechanisms are investigated. The analysis is based on proton-proton collision data collected at a center-of-mass energy of $ \sqrt{s}= $ 13 TeV by the CMS experiment at the LHC, corresponding to an integrated luminosity of 138 fb$ ^{-1} $. The nonresonant analysis targets the standard model ZZ and ZH processes in the $ \mathrm{bb}\tau\tau $ final state, motivated by the prominent role of this channel in searches for nonresonant Higgs boson pair production. The extracted best-fit signal strengths are $ \mu_{\mathrm{ZZ}} = $ 0.1 $ \pm $ 0.7 (stat) $ \pm $ 0.8 (syst) for ZZ production, and $ \mu_{\mathrm{ZH}} = - $ 1.4 $ \pm $ 1.2 (stat) $ \pm $ 1.0 (syst) for ZH production, both consistent with standard model predictions. The resonant searches target physics beyond the standard model, probing heavy spin-0 resonances that decay into ZZ and spin-1 resonances $ \mathrm{Z}' $ that decay into ZH, with masses between 200 GeV and 6 TeV. Upper limits at 95% confidence level are set on the product of the production rate and branching fraction $ \sigma(\mathrm{X})\mathcal{B}(\mathrm{X}\to\mathrm{ZZ}) $, ranging from 300 $ \mathrm{pb} $ to 24 $ \mathrm{fb} $, and on $ \sigma(\mathrm{Z}')\mathcal{B}(\mathrm{Z}'\!\to\!\mathrm{ZH}) $, ranging from 0.4 $ \mathrm{pb} $ to 12 $ \mathrm{fb} $. No deviation from standard model expectations is observed. | ||
| Links: CDS record (PDF) ; CADI line (restricted) ; | ||
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Compact Muon Solenoid LHC, CERN |
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