期刊
PHYSICAL REVIEW LETTERS
卷 115, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.181602
关键词
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资金
- Walter Burke Institute at Caltech
- DOE [DE-SC0011632, DE-SC0003930]
- U.S. Department of Energy (DOE) [DE-SC0003930] Funding Source: U.S. Department of Energy (DOE)
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 tildet) - m(chi) greater than or similar to 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 tildet). 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 tildet) around 800 GeV.
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