Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/8723
Title: Search for top squarks and dark matter particles in opposite-charge dilepton final states at root s=13 TeV
Authors: Karapınar, Güler
CMS Collaboration
Publisher: American Physical Society
Abstract: A search for new physics is presented in final states with two oppositely charged leptons (electrons or muons), jets identified as originating from b quarks, and missing transverse momentum (p(T)(miss)). The search uses proton-proton collision data at root s = 13 TeV amounting to 35.9 fb(-1) of integrated luminosity collected using the CMS detector in 2016. Hypothetical signal events are efficiently separated from the dominant t (t) over bar background with requirements on p(T)(miss) and transverse-mass variables. No significant deviation is observed from the expected background. Exclusion limits are set in the context of simplified supersymmetric models with pair-produced top squarks. For top squarks, decaying exclusively to a top quark and a neutralino, exclusion limits are placed at 95% confidence level on the mass of the lightest top squark up to 800 GeVand on the lightest neutralino up to 360 GeV. These results, combined with searches in the single-lepton and all-jet final states, raise the exclusion limits up to 1050 GeV for the lightest top squark and up to 500 GeV for the lightest neutralino. For top squarks undergoing a cascade decay through charginos and sleptons, the mass limits reach up to 1300 GeV for top squarks and up to 800 GeV for the lightest neutralino. The results are also interpreted in a simplified model with a dark matter (DM) particle coupled to the top quark through a scalar or pseudoscalar mediator. For light DM, mediator masses up to 100 (50) GeV are excluded for scalar (pseudoscalar) mediators. The result for the scalar mediator achieves some of the most stringent limits to date in this model.
URI: https://doi.org/10.1103/PhysRevD.97.032009
https://hdl.handle.net/11147/8723
ISSN: 2470-0010
2470-0029
Appears in Collections:Rectorate / Rektörlük
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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