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In this paper, we perform a detailed analysis on the same-sign dileptonsignature in the inert doublet model. Focusing on the low dark matter massregion, we randomly scan the corresponding parameter space. Viable samplesallowed by various constraints are obtained, among which twenty benchmarkpoints are selected for further collider signature study. At hadron colliders,the same-sign dilepton signature is produced via $pp\to W^{\pm *}W^{\pm *}jj\to H^\pm H^\pm jj$ with the leptonic decay mode $ H^\pm \to HW^\pm (\to l^\pm\nu)$, where $H$ is the dark matter candidate. We investigate the testabilityof this signal at the high-luminosity LHC (HL-LHC) and the proposed 27 TeVhigh-energy LHC (HE-LHC). According to our simulation, the HL-LHC with$\mathcal{L}=3~ab^{-1}$ can hardly probe this signal. Meanwhile, for the HE-LHCwith $\mathcal{L}=15~ab^{-1}$, it is promising to obtain a $5\sigma$significance when $250~\text{GeV}\lesssim m_{H^\pm}-m_H\lesssim 300$ GeV withdark matter mass $m_H\sim 60$ or 71 GeV.

Same-Sign Dilepton Signature in the Inert Doublet Model