Evidence of $ϒ(1S) → J/ψ + χ_{c1}$ and search for double-charmonium production in ϒ(1S) and ϒ(2S) decays

Yang, S. D.S. D.YangMIN-ZU WANG2018-09-102018-09-102014-09http://inspirehep.net/record/1319178http://scholars.lib.ntu.edu.tw/handle/123456789/386156Evidence of $ϒ(1S) → J/ψ + χ_{c1}$ and search for double-charmonium production in ϒ(1S) and ϒ(2S) decaysjournal article10.1103/PhysRevD.90.112008