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Top squark (stop) plays a key role in the radiative stability of the Higgsboson mass in supersymmetry (SUSY). The LHC searches for stop have made a greatprogress and tightly constrained the stop mass during Run-1. In this work, weuse the LHC Run-1 data to determine the lower mass limit of the right-handedstop in a natural SUSY scenario, where the higgsinos $\tilde{\chi}^0_{1,2}$ and$\tilde{\chi}^\pm_{1}$ are light and nearly degenerate. We find that the stopmass has been excluded up to 430 GeV for $m_{\tilde{\chi}^0_1} \lesssim 250$GeV and to 540 GeV for $m_{\tilde{\chi}^0_1} \simeq 100$ GeV by the Run-1 SUSYsearches for $2b+E^{miss}_T$ and $1\ell+jets+E^{miss}_T$, respectively. In asmall strip of parameter space with $m_{\tilde{\chi}^0_1} \gtrsim 190$ GeV, thestop mass can still be as light as 210 GeV and compatible with the Higgs massmeasurement and the monojet bound. The 14 TeV LHC with a luminosity of 20fb$^{-1}$ can further cover such a light stop window by monojet and$2b+E^{miss}_T$ searches and push the lower bound of the stop mass to 710 GeV.We also explore the potential to use the Higgs golden ratio,$D_{\gamma\gamma}=\sigma(pp \to h \to \gamma\gamma)/\sigma(pp \to h \to ZZ^*\to4\ell^\pm)$, as a complementary probe for the light and compressed stop. Ifthis golden ratio can be measured at percent level at the high luminosity LHC(HL-LHC) or future $e^+e^-$ colliders, the light stop can be excluded for mostof the currently allowed parameter region.

Closing up a light stop window in natural SUSY at LHC