PAO-TI CHANGWEI-SHU HOU2022-04-252022-04-25202124700010https://www.scopus.com/inward/record.uri?eid=2-s2.0-85117902349&doi=10.1103%2fPhysRevD.104.072008&partnerID=40&md5=d3d630707e9844edcd1b4f0b2a319811https://scholars.lib.ntu.edu.tw/handle/123456789/606584Using of data collected with the Belle detector operating at the KEKB asymmetric-energy collider, we present a measurement of the branching fraction of the singly Cabibbo-suppressed decay . A clear signal is observed for with a statistical significance of 9.1 standard deviations, and we measure the ratio of branching fractions , from which we infer the branching fraction . The first quoted uncertainty is statistical, the second systematic, and the third from the reference mode . ? 2021 Published by the American Physical Societyjournal article10.1103/PhysRevD.104.0720082-s2.0-85117902349