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.

提出了对最终状态的顶夸克（顶夸克）的超对称伙伴的搜索，具有两个带相反电荷的轻子（电子或 μ 子），射流被识别为源自\({\text {b}}\)夸克，并且缺少横向势头。搜索使用 CMS 探测器收集的\(\sqrt{s}=13\,\text {TeV} \)处质子-质子碰撞的数据，对应于 137 \(\,{\text {fb的综合光度}}^{-1}\). 假设的信号事件有效地与主要的顶夸克对产生背景分离，并要求缺失横向动量的重要性和横向质量变量。没有观察到与预期背景的显着偏差。排除限制是在简化的超对称模型的上下文中设置的，该模型具有成对产生的最轻的顶夸克。对于只衰变为顶夸克和最轻中性子的顶夸克，顶夸克和中性子质量的下限置信水平为\(95\%\)，最高可达 925 和 450 \(\,\text { GeV}\)，分别。如果衰变通过一个中间电荷进行，则最轻顶夸克质量的相应下限设置为 850\(\,\text {GeV}\)用于 420 以下的中性子质量\(\,\text {GeV}\)。对于通过charginos和sleptons 进行级联衰变的顶夸克，顶夸克和最轻的中性。