PAO-TI CHANGMIN-ZU WANGKAI-FENG CHEN2018-09-102018-09-102003-05http://inspirehep.net/record/619381http://scholars.lib.ntu.edu.tw/handle/123456789/302822We report the observation of the decay mode B -> phi phi K based on an analysis of 78 fb^{-1} of data collected with the Belle detector at KEKB. This is the first example of a b -> s sbar s sbar s transition. The branching fraction for this decay is measured to be B(B^{+-} -> phi phi K^{+-}) = (2.6 ^{+1.1}_{-0.9} +- 0.3) x 10^{-6} for a phi phi invariant mass below 2.85 GeV/c^2. Results for other related charmonium decay modes are also reported.journal article10.1103/PhysRevLett.91.241802