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arXiv · 1609.02361

Top-squark in natural SUSY under current LHC run-2 data

Chengcheng Han·Jie Ren·Lei Wu·Jin Min Yang·Mengchao Zhang
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Abstract

We utilize the recent LHC-13 TeV data to study the lower mass bound on top-squark (stop) in natural supersymmetry. We recast the LHC sparticle inclusive search of $(\ge 1){\rm jets} + E^{miss}_T$ with $α_T$ variable, the direct stop pair search (1-lepton channel and all-hadronic channel) and the monojet analyses. We find that these searches are complementary depending on stop and higgsino masses: for a heavy stop the all-hadronic stop pair search provides the strongest bound, for an intermediate stop the inclusive SUSY analysis with $α_T$ variable is most efficient, while for a compressed stop-higgsino scenario the monojet search plays the key role. Finally, the lower mass bound on a stop is: (i) 320 GeV for compressed stop-higgsino scenario (mass splitting less than 20 GeV); (ii) 765 (860) GeV for higgsinos lighter than 300 (100) GeV.

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Chengcheng Han, Jie Ren, Lei Wu, Jin Min Yang, Mengchao Zhang. 2017-01-16. Top-squark in natural SUSY under current LHC run-2 data. https://doi.org/10.1140/epjc%2Fs10052-017-4662-7

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