# Measuring Masses in Semi-Invisible Final States at Electron-Positron Colliders

12 Jun 2017 Xiang Qian-Fei Bi Xiao-Jun Yan Qi-Shu Yin Peng-Fei Yu Zhao-Huan

Mass measurement of a particle whose decay products including invisible particles is a challenging task at colliders. For a new physics model involving a dark matter candidate $N$ and a $Z_2$ symmetry that stabilizes it, a typical new process at $e^+e^-$ colliders is the pair production $e^+e^- \to Y\bar{Y}$ followed by decay processes $Y\to aN$ and $\bar{Y}\to b\bar{N}$, where $a$ and $b$ are visible but $N$ is invisible... (read more)

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