Anomalous dipion invariant mass distribution of the ϒ(4S) decays into ϒ(1S)π + π − and ϒ(2S)π + π −
Eur. Phys. J. C, 71 11 (2011) 1808
Published online: 23 November 2011
DOI: 10.1140/epjc/s10052-011-1808-x