S. Jia et al. (Belle Collaboration)WEI-SHU HOU2021-07-282021-07-28201924700010https://www.scopus.com/inward/record.uri?eid=2-s2.0-85077912813&doi=10.1103%2fPhysRevD.100.111103&partnerID=40&md5=1165a82203a4e3497883e57a7ed88a9chttps://scholars.lib.ntu.edu.tw/handle/123456789/574684Using a data sample of 921.9 fb-1 collected with the Belle detector, we study the process of e+e-→Ds+Ds1(2536)-+c.c. via initial-state radiation. We report the first observation of a vector charmoniumlike state decaying to Ds+Ds1(2536)-+c.c. with a significance of 5.9σ, including systematic uncertainties. The measured mass and width are (4625.9-6.0+6.2(stat)±0.4(syst)) MeV/c2 and (49.8-11.5+13.9(stat)±4.0(syst)) MeV, respectively. The product of the e+e-→Ds+Ds1(2536)-+c.c. cross section and the branching fraction of Ds1(2536)-→D?0K-is measured from the DsDs1(2536) threshold to 5.59 GeV. ? 2019 authors. Published by the American Physical Society.journal article10.1103/PhysRevD.100.1111032-s2.0-85077912813