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Title
Japanese:Search for direct top squark pair production in final states with two leptons in s=13 TeV pp collisions with the ATLAS detector 
English:Search for direct top squark pair production in final states with two leptons in s=13 TeV pp collisions with the ATLAS detector 
Author
Japanese: M. Aaboud, 陣内 修, 久世 正弘, 山口 洋平, et al..  
English: M. Aaboud, Osamu Jinnouchi, Masahiro.Kuze, Youhei Yamaguchi, et al..  
Language English 
Journal/Book name
Japanese:European Physical Journal C 
English:European Physical Journal C 
Volume, Number, Page Vol. 77    No. 12    pp. "898"
Published date Dec. 2017 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://www.scopus.com/inward/record.uri?eid=2-s2.0-85039710380&doi=10.1140%2fepjc%2fs10052-017-5445-x&partnerID=40&md5=0325034ca5880d7206d2e258d8e0c16f
 
DOI https://doi.org/10.1140/epjc/s10052-017-5445-x
Abstract The results of a search for direct pair production of top squarks in events with two opposite-charge leptons (electrons or muons) are reported, using $36.1~\hbox {fb}^{-1}$ of integrated luminosity from proton?proton collisions at $\sqrt{s}=13$ TeV collected by the ATLAS detector at the Large Hadron Collider. To cover a range of mass differences between the top squark $\tilde{t}$ and lighter supersymmetric particles, four possible decay modes of the top squark are targeted with dedicated selections: the decay $\tilde{t} \rightarrow b \tilde{\chi }_{1}^{\pm }$ into a b-quark and the lightest chargino with $\tilde{\chi }_{1}^{\pm } \rightarrow W \tilde{\chi }_{1}^{0}$ , the decay $\tilde{t} \rightarrow t \tilde{\chi }_{1}^{0}$ into an on-shell top quark and the lightest neutralino, the three-body decay $\tilde{t} \rightarrow b W \tilde{\chi }_{1}^{0}$ and the four-body decay $\tilde{t} \rightarrow b \ell \nu \tilde{\chi }_{1}^{0}$ . No significant excess of events is observed above the Standard Model background for any selection, and limits on top squarks are set as a function of the $\tilde{t}$ and $\tilde{\chi }_{1}^{0}$ masses. The results exclude at 95% confidence level $\tilde{t}$ masses up to about 720 GeV, extending the exclusion region of supersymmetric parameter space covered by previous

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