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| CMS-PAS-EXO-23-010 | ||
| Search for nonresonant new physics in high-mass dilepton events in association with b-tagged jets | ||
| CMS Collaboration | ||
| 23 July 2024 | ||
| Abstract: A search for nonresonant new physics phenomena in high-mass dilepton events produced in association with b-tagged jets is performed using the data collected by the CMS experiment at the CERN LHC at a center-of-mass energy of 13 TeV. The analysis considers two EFT-based models with 6-dimensional operators involving four fermion contact interactions between two leptons (electrons and muons) and b or s quarks ($ \mathrm{bb\ell\ell} $ and $ \mathrm{bs\ell\ell} $). The analysis considers two lepton flavor combinations ($ \mathrm{ee} $ and $ \mu\mu $) and classifies events as having 0, 1, and $ \geq 2 \mathrm{b} $-tagged jets in the final state. No significant excess is observed over the smoothly falling standard model background. Upper limits on the product of production cross section and branching fraction of the new physics are set. These translate into lower limits on the energy scale $ \Lambda $ of 8.3 to 9.0 TeV in the $ \mathrm{bb\ell\ell} $ model, depending on model parameters, and on the ratio of energy scale and coupling $ \Lambda/g_{*} $ of 2.0 to 2.6 TeV in the $ \mathrm{bs\ell\ell} $ model. The latter represent the most stringent limits on this model to date. Lepton flavor universality is also tested by comparing the dielectron and dimuon mass spectra for different b-tagged jet multiplicities. | ||
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These preliminary results are superseded in this paper, Submitted to JHEP. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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