CMS-PAS-SUS-20-002

CMS-PAS-SUS-20-002
Combined searches for the production of supersymmetric top quark partners in proton-proton collisions at $\sqrt{s}=$ 13 TeV
CMS Collaboration
March 2021

Abstract: A combination of searches for the production of a pair of top squarks using 137 fb$^{-1}$ of proton-proton collision data at $\sqrt{s}=$ 13 TeV collected by the CMS experiment is presented. Signatures with at least 2 jets and large missing transverse momentum are categorized into events with 0, 1, and 2 leptons and additional jets. New results for regions of parameter space where the kinematics of top squark pair production and top quark pair production are very similar, owing to the mass difference between the top squark and the neutralino being close to the top quark mass, are presented. Depending on the model, the combined result excludes a top squark mass up to 1325 GeV for a massless lightest supersymmetric particle (LSP), and an LSP mass up to 700 GeV for a top squark mass of 1150 GeV. Top squarks with mass from 145 to 275 GeV, for LSP mass from 0 to 100 GeV, with a small mass difference between the top squark and the LSP of less than 30 GeV, are excluded for the first time with CMS data. In an alternative signal model of dark matter production via a spin-0 mediator in association with a top quark pair, upper limits on the mediator particle masses of up to 420 GeV are set.
Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to EPJC. The superseded preliminary plots can be found here.

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