Journal article
Observation of a charmoniumlike state produced in association with a J/ψ in e e- annihilation at s 10.6GeV
K Abe, I Adachi, H Aihara, K Arinstein, Y Asano, V Aulchenko, T Aushev, T Aziz, AM Bakich, V Balagura, M Barbero, I Bedny, U Bitenc, I Bizjak, A Bondar, M Bračko, J Brodzicka, TE Browder, Y Chao, A Chen Show all
Physical Review Letters | Published : 2007
Abstract
We report the first observation of a charmoniumlike state recoiling from the J/ψ in the inclusive process e+e-→J/ψ+anything at a mass of (3.943±0.006±0.006)GeV/c2. We also observe the decay of this state into D*D̄ and determine its intrinsic width to be less than 52MeV/c2 at the 90% C.L. These results are obtained from a 357fb-1 data sample collected with the Belle detector near the Υ(4S) resonance, at the KEKB asymmetric-energy e+e- collider. © 2007 The American Physical Society.