PAO-TI CHANGWEI-SHU HOU2022-04-252022-04-25202124700010https://www.scopus.com/inward/record.uri?eid=2-s2.0-85108721907&doi=10.1103%2fPhysRevD.103.112002&partnerID=40&md5=1c94a8e1b90ed5705c35b27186f82101https://scholars.lib.ntu.edu.tw/handle/123456789/606604Using the entire data sample of 980 fb-1 integrated luminosity collected with the Belle detector at the KEKB asymmetric-energy e+e- collider, we present an amplitude analysis measuring the branching fractions of the Cabibbo-allowed, W-exchange resonant decay Ξc0→Ξ0φ(→K+K-) with a polarized φ and the nonresonant decay via a direct process Ξc0→Ξ0K+K-. We present these measurements, relative to the normalization mode Ξ-π+, and find branching ratios B(Ξc0→Ξ0φ(→K+K-))(BΞc0→Ξ-π+)=0.036±0.004(stat.)±0.002(syst.) and B(Ξc0→Ξ0K+K-)B(Ξc0→Ξ-π+)=0.039±0.004(stat.)±0.002(syst.), which suggest that only minor cusping peaks occur in the combinatorial background of ω?-→Ξ0K- due to these Ξc0 decays. ? 2021 authors. Published by the American Physical Society.journal article10.1103/PhysRevD.103.1120022-s2.0-85108721907