[Seminar] Exploring properties of long-lived particles in inelastic dark matter models at Belle II

Thursday 15 Jul 2021, 14:00 → 16:00 Asia/Seoul

The inelastic dark matter model is one kind of popular models for the sub-GeV dark matter (DM). If the mass splitting between DM excited and ground states is small enough, the co-annihilation becomes the dominant channel for thermal relic density

and the DM excited state can be long-lived at the collider scale. We study scalar and fermion inelastic dark matter models for sub-GeV DM at Belle II with $U(1)_D$ dark gauge symmetry broken into its $Z_2$ subgroup. We focus on dilepton displaced

vertex signatures from decays of the DM excited state. With the help of precise displaced vertex detection ability at Belle II, we can explore the DM spin, mass and mass splitting between DM excited and ground states. Especially, we show scalar and

fermion DM candidates can be discriminated and the mass and mass splitting of DM sector can be determined within the percentage of deviation for some benchmark points.

 

https://yonsei.zoom.us/j/89500845677