Speaker
Description
Dark matter constitutes a significant component of the universe's matter, but its fundamental properties, such as mass and interactions, remain a longstanding mystery. Direct detection experiments have imposed stringent experimental constraints on dark matter with masses greater than 1 GeV, while much looser limits apply to lighter sub-GeV dark matter due to their non-relativistic velocities, which prevent them from reaching the detection thresholds of most traditional experimental methods. We present our search for escaping sub-GeV dark matter particles through η → π⁰ + invisible in the Beijing Spectrometer III experiment at the Beijing Electron-Positron Collider. Our results impose stringent limits on the coupling of sub-GeV dark matter to SM quarks and explore the favored parameters from thermal relic dark matter. Compared to direct detection limits, this search improves the constraints on the sub-GeV dark matter-nucleon scattering cross-section by approximately 5 orders of magnitude, providing valuable insights into sub-GeV dark matter.
| 请选择分会 | TeV物理和超出标准模型新物理 |
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