# Search for direct pair production of scalar top quarks in the single- and dilepton channels in proton-proton collisions at $\sqrt{s}$ = 8 TeV

CMS Collaboration; Canelli, F; Chiochia, V; Kilminster, B; Robmann, P; et al (2016). Search for direct pair production of scalar top quarks in the single- and dilepton channels in proton-proton collisions at $\sqrt{s}$ = 8 TeV. Journal of High Energy Physics, 1607:1-44.

## Abstract

Results are reported from a search for the top squark $\tilde{t}_{1}$, the lighter of the two supersymmetric partners of the top quark. The data sample corresponds to 19.7 fb$^{−1}$ of proton-proton collisions at $\sqrt{s}$ = 8 TeV collected with the CMS detector at the LHC. The search targets $\tilde{t}_{1} → b\tilde{x}^{±}_{1}$ and $\tilde{t}_{1} → t^{(*)}\tilde{x}^{0}_{1}$ decay modes, where $\tilde{x}^{±}_{1}$ and $\tilde{x}^{0}_{1}$ are the lightest chargino and neutralino, respectively. The reconstructed final state consists of jets, b jets, missing transverse energy, and either one or two leptons. Leading back- grounds are determined from data. No significant excess in data is observed above the expectation from standard model processes. The results exclude a region of the 00 two-dimensional plane of possible $\tilde{t}_{1}$ and $\tilde{x}^{0}_{1}$ masses. The highest excluded $\tilde{t}_{1}$ and $\tilde{x}^{0}_{1}$ masses are about 700 GeV and 250 GeV, respectively.

## Abstract

Results are reported from a search for the top squark $\tilde{t}_{1}$, the lighter of the two supersymmetric partners of the top quark. The data sample corresponds to 19.7 fb$^{−1}$ of proton-proton collisions at $\sqrt{s}$ = 8 TeV collected with the CMS detector at the LHC. The search targets $\tilde{t}_{1} → b\tilde{x}^{±}_{1}$ and $\tilde{t}_{1} → t^{(*)}\tilde{x}^{0}_{1}$ decay modes, where $\tilde{x}^{±}_{1}$ and $\tilde{x}^{0}_{1}$ are the lightest chargino and neutralino, respectively. The reconstructed final state consists of jets, b jets, missing transverse energy, and either one or two leptons. Leading back- grounds are determined from data. No significant excess in data is observed above the expectation from standard model processes. The results exclude a region of the 00 two-dimensional plane of possible $\tilde{t}_{1}$ and $\tilde{x}^{0}_{1}$ masses. The highest excluded $\tilde{t}_{1}$ and $\tilde{x}^{0}_{1}$ masses are about 700 GeV and 250 GeV, respectively.

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