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Updated: Mar 30, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Opening Up the Compressed Region of Top Squark Searches at 13 TeV LHC
Haipeng An1, Lian-Tao Wang2,3
1Walter Burke Institute for Theoretical Physics, California Institute of Technology, Pasadena, California 91125, USA.
Abstract:
Light top superpartners play a key role in stabilizing the electroweak scale in supersymmetric theories. For R-parity conserved supersymmetric models, traditional searches are not sensitive to the compressed regions. In this Letter, we propose a new method targeting this region, with top squark and neutralino mass splitting ranging from m_{t[over ˜]}-m_{χ}≳m_{t} to about 20 GeV. In particular, we focus on the signal process in which a pair of top squarks are produced in association with a hard jet, and we define a new observable R_{M} whose distribution has a peak in this compressed region. The position of the peak is closely correlated with m_{t[over ˜]}. We show that for the 13 TeV LHC with a luminosity of 3000 fb^{-1}, this analysis can extend the reach of the top squark in the compressed region to m_{t[over ˜]} around 800 GeV.
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