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Search for pair production of top squarks and for dark matter in final states with two leptons using data collected by the ATLAS experiment during the LHC Run 2

A search for the direct pair production of top squarks $(\tilde{t})$ and for dark matter in events with two opposite-charge leptons, jets and missing transverse momentum is presented. The analysis is based on 139 fb$^{-1}$ of proton-proton collision data recorded by the ATLAS experiment at the Large...

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Detalles Bibliográficos
Autor principal: Gravili, F G
Lenguaje:eng
Publicado: 2021
Materias:
Acceso en línea:https://dx.doi.org/10.1393/ncc/i2021-21048-y
http://cds.cern.ch/record/2791563
Descripción
Sumario:A search for the direct pair production of top squarks $(\tilde{t})$ and for dark matter in events with two opposite-charge leptons, jets and missing transverse momentum is presented. The analysis is based on 139 fb$^{-1}$ of proton-proton collision data recorded by the ATLAS experiment at the Large Hadron Collider (LHC) at $\sqrt{s} = 13$TeV. Concerning the pair production of top squarks, current results extend previous exclusion limits with sensitivity across a wide range of mass differences between the $\tilde{t}$ and the lightest neutralino $\tilde{\chi}^0_1$. Furthermore, spin-0 mediator dark matter models are considered, with the mediator being produced in association with a pair of top squarks. No significant deviations from the Standard Model expectations are observed and limits at 95%confidence level (CL) are set on the masses of $\tilde{t}$, $\tilde{\chi}^0_1$ and dark matter mediators.