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arXiv · 2304.01082

Investigating the GmSUGRA in the MSSM through the long-lived bino NLSP at the HL-LHC

Wenxing Zhang·Waqas Ahmed·Imtiaz Khan·Tianjun Li·Shabbar Raza
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Abstract

The axino, the supersymmetric partner of axion, is a well-motivated warm/hot dark matter candidate, and provides a natural solution to the relic density problem for the bino-like neutralino if it is the lightest supersymmetric particle (LSP). With the Generalized Minimal Supergravity, we study such kind of the viable parameter space where the bino-like neutralino is the next-to-LSP (NLSP) and the axino is the LSP. In addition, we consider a scenario where the bino is a long-lived NLSP with the lifetime varying from $10^{-6}$s to $10^{-4}$s, and then propose a new signal searching scheme involving one displaced photon together with the large missing transverse momentum at the HL-LHC. The bino-like lightest neutralino lies under or around 100 GeV and is produced as a decay product of the right-handed sleptons.The relevant axion coupling $f_a$ can be probed up to $\mathcal{O}(10^9)$ GeV at 2$\sigma$ level for the right-handed slepton mass under 300 GeV and the lightest neutralino mass under 100 GeV.

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Wenxing Zhang, Waqas Ahmed, Imtiaz Khan, Tianjun Li, Shabbar Raza. 2023-04-03. Investigating the GmSUGRA in the MSSM through the long-lived bino NLSP at the HL-LHC. https://arxiv.org/abs/2304.01082

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