Search for direct top squark pair production in final states with two leptons in √ s = 13 TeV pp collisions with the ATLAS detector
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 fb^-1 of integrated luminosity from proton–proton collisions at √s = 13 TeV collected by the ATLAS detector at the Large Hadron Collider. To cove...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Published: |
Springer
2017
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| Summary: | 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 fb^-1 of integrated luminosity from proton–proton collisions at √s = 13 TeV collected by the ATLAS detector at the Large Hadron Collider. To cover a range of mass differences between the top squark t˜ and lighter supersymmetric particles, four possible decay modes of the top squark are targeted with dedicated selections: the decay t˜ → b χ˜±1 into a b-quark and the lightest chargino with χ˜±1 → Wχ˜01, the decay t˜ → t χ˜01 into an on-shell top quark and the lightest neutralino, the three-body decay t˜ → bW χ˜01 and the four-body decay t˜ → b`𝓁vχ˜01 . 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 t˜ and χ˜01 masses. The results exclude at 95% confidence level χ˜01 masses up to about 720 GeV, extending the exclusion region of supersymmetric parameter space covered by previous searches. |
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