Observation of Upsilon(2S)-->etaUpsilon(1S) and search for related transitions. (Physical Review Letters, 2008)

(untitled) - He, Q; Insler, J; Muramatsu, H; Park, C; Thorndike, E; Yang, F; Artuso, M; Blusk, S; Khalil, S; Li, J; Mountain, R; Nisar, S; et al.