Search for and branching fraction measurement of

Pal, B.*; Tanida, Kiyoshi   ; Belle Collaboration*; 154 of others*

We have searched for the Cabibbo-suppressed decay in collisions using a data sample corresponding to an integrated luminosity of 915 fb. The data were collected by the Belle experiment at the KEKB asymmetric-energy collider running at or near the and resonances. No significant signal is observed, and we set an upper limit on the branching fraction of at 90% confidence level. The contribution of nonresonant decays is found to be consistent with zero, and the corresponding upper limit on its branching fraction is set to be at 90% confidence level. We also search for an intermediate hidden-strangeness pentaquark decay . We see no evidence for this intermediate decay and set an upper limit on the product branching fraction of at 90% confidence level. Finally, we measure the branching fraction for the Cabibbo-favored decay, ; the result is , which is the most precise measurement to date.