Search for at Belle
arXiv:2207.06595
Abstract
We search for the singly Cabibbo-suppressed decay using the full data set of 988 fb recorded by the Belle experiment at the KEKB collider. We measure the branching fraction for this decay to be with an upper limit at 95% credibility of . We also measure the sum of the branching fractions for and to be with an upper limit at 95% credibility of .