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A search for the supersymmetric partners of the Standard Model bottom and topquarks is presented. The search uses 36.1 fb$^{-1}$ of $pp$ collision data at$\sqrt{s}=13$ TeV collected by the ATLAS experiment at the Large HadronCollider. Direct production of pairs of bottom and top squarks ($\tilde{b}_{1}$and $\tilde{t}_{1}$) is searched for in final states with $b$-tagged jets andmissing transverse momentum. Distinctive selections are defined with either nocharged leptons (electrons or muons) in the final state, or one charged lepton.The zero-lepton selection targets models in which the $\tilde{b}_{1}$ is thelightest squark and decays via $\tilde{b}_{1} \rightarrow b\tilde{\chi}^{0}_{1}$, where $\tilde{\chi}^{0}_{1}$ is the lightest neutralino.The one-lepton final state targets models where bottom or top squarks areproduced and can decay into multiple channels, $\tilde{b}_{1} \rightarrow b\tilde{\chi}^{0}_{1}$ and $\tilde{b}_{1} \rightarrow t \tilde{\chi}^{\pm}_{1}$,or $\tilde{t}_{1} \rightarrow t \tilde{\chi}^{0}_{1}$ and $\tilde{t}_{1}\rightarrow b \tilde{\chi}^{\pm}_{1}$, where $\tilde{\chi}^{\pm}_{1}$ is thelightest chargino and the mass difference $m_{\tilde{\chi}^{\pm}_{1}}-m_{\tilde{\chi}^{0}_{1}}$ is set to 1 GeV. No excess above the expectedStandard Model background is observed. Exclusion limits at 95\% confidencelevel on the mass of third-generation squarks are derived in varioussupersymmetry-inspired simplified models.

the journal of high energy physics/the journal of high energy physics

Search for supersymmetry in events with $b$-tagged jets and missing  transverse momentum in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS  detector