Mono-top signature from stop decay at the HE-LHC

Abstract

Searching for the top squark (stop) is a key task to test the naturalness of SUSY. Different from stop pair production, single stop production relies on its electroweak properties and can provide some unique signatures. Following the single production process pp → t ˜ 1 χ ˜ 1 − → t χ ˜ 1 0 χ ˜ 1 − , the top quark has two decay channels: leptonic channel and hadronic channel. In this paper, we probe the observability of these two channels in a simplified minimal supersymmetric standard model scenario. We find that, at the 27 TeV LHC with the integrated luminosity of  = 15 ab − 1 , m t ˜ 1 < 1900 GeV and μ < 750 GeV can be excluded at 2σ through the leptonic mono-top channel, while m t ˜ 1 < 1200 GeV and μ < 350 GeV can be excluded at 2σ through the hadronic channel.