Compact Muon Solenoid
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| CMS-PAS-EXO-22-014 | ||
| Search for dark matter produced in association with a single top quark or a top quark pair in proton-proton collisions at $ \sqrt{s}= $ 13 TeV | ||
| CMS Collaboration | ||
| 15 April 2024 | ||
| Abstract: A search is performed for dark matter produced in association with top quarks using the data collected by the CMS detector at the LHC from proton-proton collisions at a centre-of-mass energy of 13 TeV, corresponding to 138 fb$ ^{-1} $ of integrated luminosity. The analysis explores the production of dark matter particles in association with a single top quark or a pair of top quarks. Various decay modes of the top quark are probed, resulting in three separate channels based on the number of leptons in the final state, namely the all-hadronic (zero lepton), semileptonic (one lepton), and the dileptonic (two leptons) final states. The results are derived from the combination of these different categories. The analysis looks for an excess of events with respect to the background-only prescription in events with a large imbalance in the transverse momentum. Novel multivariate techniques are used to take advantage of the differences in kinematics between the two dark matter associated production modes. No significant deviations with respect to the standard model predictions are observed. The results are interpreted in the context of a simplified model in which either a scalar or pseudoscalar mediator couples to top quarks and to dark matter fermions. The largest local significance is within 2 standard deviations for all mediator hypotheses. | ||
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Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to JHEP. The superseded preliminary plots can be found here.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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