Journal article
Observation of a narrow charmoniumlike state in exclusive B±→K±π π-J/ψ decays -: art. no. 262001
SK Choi, SL Olsen, K Abe, T Abe, I Adachi, BS Ahn, H Aihara, K Akai, M Akatsu, M Akemoto, Y Asano, T Aso, V Aulchenko, T Aushev, AM Bakich, Y Ban, S Banerjee, A Bondar, A Bozek, M Bracko Show all
PHYSICAL REVIEW LETTERS | AMERICAN PHYSICAL SOC | Published : 2003
Abstract
We report the observation of a narrow charmoniumlike state produced in the exclusive decay process B+/--->K+/-pi(+)pi(-)J/psi. This state, which decays into pi(+)pi(-)J/psi, has a mass of 3872.0+/-0.6(stat)+/-0.5(syst) MeV, a value that is very near the M(D0)+M(D(*0)) mass threshold. The results are based on an analysis of 152M B-Bmacr; events collected at the Upsilon(4S) resonance in the Belle detector at the KEKB collider. The signal has a statistical significance that is in excess of 10sigma.