Chilikin, K. et al. (Belle Collaboration)K. et al. (Belle Collaboration)ChilikinWEI-SHU HOU2021-07-282021-07-28201924700010https://www.scopus.com/inward/record.uri?eid=2-s2.0-85082978498&doi=10.1103%2fPhysRevD.100.012001&partnerID=40&md5=4cf922952a5e5cbbcbce0b86a99a7179https://scholars.lib.ntu.edu.tw/handle/123456789/574855A search for the decays B+→hcK+ and B0→hcKS0 is performed. Evidence for the decay B+→hcK+ is found; its significance is 4.8σ. No evidence is found for B0→hcKS0. The branching fraction for B+→hcK+ is measured to be (3.7-0.9+1.0 -0.8+0.8)×10-5; the upper limit for the B0→hcKS0 branching fraction is 1.4×10-5 at 90% C.L. In addition, a study of the ppπ+π- invariant mass distribution in the channel B+→(ppπ+π-)K+ results in the first observation of the decay ηc(2S)→ppπ+π- with 12.1σ significance. The analysis is based on the 711 fb-1 data sample collected by the Belle detector at the asymmetric-energy e+e- collider KEKB at the (4S) resonance. ? 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the ?https://creativecommons.org/licenses/by/4.0/? Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.journal article10.1103/PhysRevD.100.0120012-s2.0-85082978498