Abstract
A search is presented for supersymmetric partners of the top quark (top squarks) in final states with two oppositely charged leptons (electrons or muons), jets identified as originating from {text {b}}quarks, and missing transverse momentum. The search uses data from proton-proton collisions at sqrt{s}=13,text {TeV} collected with the CMS detector, corresponding to an integrated luminosity of 137,{text {fb}}^{-1}. Hypothetical signal events are efficiently separated from the dominant top quark pair production background with requirements on the significance of the missing transverse momentum and on 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 lightest top squarks. For top squarks decaying exclusively to a top quark and a lightest neutralino, lower limits are placed at 95% confidence level on the masses of the top squark and the neutralino up to 925 and 450,text {GeV}, respectively. If the decay proceeds via an intermediate chargino, the corresponding lower limits on the mass of the lightest top squark are set up to 850,text {GeV} for neutralino masses below 420,text {GeV}. For top squarks undergoing a cascade decay through charginos and sleptons, the mass limits reach up to 1.4,text {TeV} and 900,text {GeV} respectively for the top squark and the lightest neutralino.
Highlights
We present a search for top squark pair production in data from proton-proton collisions collected at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 137 fb−1, with the CMS detector at the LHC from 2016 to 2018
The search is performed in final states with two leptons, hadronic jets identified as originating from bquarks, and significant missing transverse momentum
The observed excess events in SR10SF are found to be close to the signal region selection thresholds
Summary
We present a search for top squark pair production in data from proton-proton (pp) collisions collected at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 137 fb−1, with the CMS detector at the LHC from 2016 to 2018. The large background from the SM top quark–antiquark pair production (tt) is reduced by several orders of magnitude through the use of specially designed transverse-mass variables [19,20]. Simplified models [21,22,23] of strong top squark pair production and different top squark decay modes are considered. [24], top squark decays to top quarks and neutralinos (χ10, identified as LSPs) are described by the T2tt model (Fig. 1, left). In the T2bW model (Fig. 1, center), both top squarks decay via an interme-
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