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 cover...
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| Autores principales: | , , , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2017
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/82160 |
| Aporte de: |
| Sumario: | 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 → bχ<sup>±</sup><sub>1</sub> into a b-quark and the lightest chargino with χ<sup>±</sup><sub>1</sub> → Wχ<sup>0</sup><sub>1</sub>, the decay t → tχ<sup>0</sup><sub>1</sub> into an on-shell top quark and the lightest neutralino, the three-body decay t → bWχ<sup>0</sup><sub>1</sub> and the four-body decay t → bℓνχ<sup>0</sup><sub>1</sub>. 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<sup>0</sup><sub>1</sub> masses. The results exclude at 95% confidence level t masses up to about 720 GeV, extending the exclusion region of supersymmetric parameter space covered by previous searches |
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