# Search for dark matter produced in association with a single top quark or a top quark pair in proton-proton collisions at √s = 13 TeV

CMS Collaboration; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Dragicevic, M.; Erö, J.; Escalante Del Valle, A.; Flechl, M.; Frühwirth, R.; Ghete, V. M.; Hrubec, J.; Jeitler, M.; Krammer, N.; Krätschmer, I.; Liko, D.; Madlener, T.; Mikulec, I.; ... mehr

##### Abstract:
A search for dark matter produced in association with top quarks in proton-proton collisions at a center-of-mass energy of 13 TeV is presented. The data set used corresponds to an integrated luminosity of 35.9 fb−1 recorded with the CMS detector at the LHC. Whereas previous searches for neutral scalar or pseudoscalar mediators considered dark matter production in association with a top quark pair only, this analysis also includes production modes with a single top quark. The results are derived from the combination of multiple selection categories that are defined to target either the single top quark or the top quark pair signature. 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 a scalar or pseudoscalar mediator particle couples to a top quark and subsequently decays into dark matter particles. Scalar and pseudoscalar mediator particles with masses below 290 and 300 GeV, respectively, are excluded at 95% confidence level, assuming a dark matter particle mass of 1 GeV and mediator couplings to fermions and dark matter particles equal to unity.

 Zugehörige Institution(en) am KIT Institut für Experimentelle Teilchenphysik (ETP) Publikationstyp Zeitschriftenaufsatz Jahr 2019 Sprache Englisch Identifikator ISSN: 1029-8479 KITopen-ID: 1000095071 Erschienen in Journal of high energy physics Band 2019 Heft 3 Seiten Article: 141 Bemerkung zur Veröffentlichung Gefördert durch SCOAP3 Vorab online veröffentlicht am 25.03.2019 Nachgewiesen in arXivScopus
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