Search for an exotic light particle at Belle

Details Search for an exotic light particle at Belle Search for an exotic light particle at Belle

2010-06-05

arxiv.org/abs/1006.1037v2

Physics

High Energy Physics

High Energy Physics - Experiment

3 pages, Proceedings of the Lake Louise Winter Institute, 15th-20th February 2010, Alberta, Canada

Scientific paper

The HyperCP experiment reported the observation of three events for the $\Sigma^+ \rightarrow p \mu^+\mu^-$ 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, $\Sigma^+ \rightarrow pX^0$, $X^0 \rightarrow \mu^+\mu^-$, 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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