Probing Relatively Heavier Right-Handed Selectron at the CEPC, $\mathbf{FC}{\mathbf{C}}_{\mathbf{ee}}$ and ILC

Abstract

We employ the low energy Minimal Supersymmetric Standard Model (MSSM) to explore the parameter space associated with $Z$-pole and Higgs-pole solutions. Such parameter spaces can not only saturate the cold dark matter relic density bound within 5$\sigma$ set by the Planck 2018, but also satisfy the other standard collider mass bounds and B-physics bounds. In particular, we show that the right-handed selectron can be light. Thus, we propose a search for the relatively heavier right-handed selectron at the future lepton colliders with the center-of-mass energy $\sqrt{s}=240$ GeV and integrated luminosity 3000 $\mathrm{f}{\mathrm{b}}^{-1}$ via mono-photon channel: $e_R^{+}{e}_R^{-}\to {\tilde{\chi }}_1^0(bino)+{\tilde{\chi }}_1^0(bino)+\gamma$. We show that for the $Z$-pole case the right-handed selectron will be excluded up to 180 GeV and 210 GeV respectively at 3$\sigma$ and 2$\sigma$, while the right-handed selectron will be excluded up to 140 GeV and 180 GeV respectively at 3$\sigma$ and 2$\sigma$ in case of Higgs-pole.

7 pages, 5 figures

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