Probing Relatively Heavier Right-Handed Selectron at the CEPC, $\rm\bf {FCC_{ee}}$ and ILC

TL;DR

This paper investigates the potential to detect relatively heavier right-handed selectrons at future lepton colliders like CEPC, FCC-ee, and ILC, within the MSSM framework, focusing on mono-photon signatures and parameter space constraints.

Contribution

It proposes a novel search strategy for heavier right-handed selectrons at future colliders using mono-photon channels, considering specific MSSM parameter spaces consistent with dark matter and collider bounds.

Findings

Right-handed selectron can be light within certain MSSM parameter spaces.

Future colliders can exclude selectron masses up to 180-210 GeV depending on the scenario.

Mono-photon channel is effective for probing heavier right-handed selectrons.

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 $\rm{fb^{-1}}$ via mono-photon channel: $e^{+}_{R} e^{-}_{R}\rightarrow {\tilde \chi_{1}^{0}(bino)}+{\tilde \chi_{1}^{0}(bino)}+{\gamma}$. 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.