Search for an exotic light particle at Belle

The HyperCP experiment reported the observation of three events for the $Σ^+ \rightarrow p μ^+μ^-$ decay. The dimuon masses of the observed events are clustered within the detector resolution of 1 MeV/$c^2$. These decays might be interpreted as a two-body decay, $Σ^+ \rightarrow pX^0$, $X^0 \rightarrow μ^+μ^-$, where $X^0$ is a new particle with mass (214.3 $\pm$ 0.5) MeV/$c^2$. We report on a search for the $X^0$ particle in $\bzkx$ and $\bzrhox$ decays using 656 million $B$ meson pairs collected with the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider.

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