Search for $\Omega (2012)\to K\Xi (1530)\to K\pi \Xi$ at Belle

Abstract

Using data samples of $e^{+}{e}^{-}$ collisions collected at the ${\rm Y}(1S)$, ${\rm Y}(2S)$, and ${\rm Y}(3S)$ resonances with the Belle detector, we search for the three-body decay of the $\Omega (2012)$ baryon to $K\pi \Xi$. This decay is predicted to dominate for models describing the $\Omega (2012)$ as a $K\Xi (1530)$ molecule. No significant $\Omega (2012)$ signals are observed in the studied channels, and 90\% credibility level upper limits on the ratios of the branching fractions relative to $K\Xi$ decay modes are obtained.

Comments: 16 pages, 5 figures