https://doi.org/10.1140/epjc/s10052-017-4662-7
Regular Article - Theoretical Physics
Top-squark in natural SUSY under current LHC run-2 data
1
Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing, Jiangsu, 210023, China
2
ARC Centre of Excellence for Particle Physics at the Terascale, School of Physics, The University of Sydney, Sydney, NSW, 2006, Australia
3
Kavli IPMU (WPI), UTIAS, University of Tokyo, Kashiwa, 277-8583, Japan
4
Computer Network Information Center, Chinese Academy of Sciences, Beijing, 100190, China
5
Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, China
6
Center for Theoretical Physics and Universe, Institute for Basic Science (IBS), Taejon, 34051, Korea
* e-mail: lei.wu1@sydney.edu.au
Received:
27
October
2016
Accepted:
16
January
2017
Published online:
11
February
2017
We utilize the recent LHC-13 TeV data to study the lower mass bound on the top-squark (stop) in natural supersymmetry. We recast the LHC sparticle inclusive search of [see pdf] 1) [see pdf] with 
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 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: (1) 320 GeV for compressed stop–higgsino scenario (mass splitting less than 20 GeV); (2) 765 (860) GeV for higgsinos lighter than 300 (100) GeV.
© The Author(s), 2017
