We report a study of B (J/??)K and B (?'?)K decay modes using 772 × 106 BB events collected at the (4S) resonance with the Belle detector at the KEKB energy-asymmetric e+e- collider. We observe X(3872) J/?? and report the first evidence for ?c2 J/?? in B (Xcc?)K decays, while in a search for X(3872) ?'? no significant signal is found. We measure the branching fractions, B(B± X(3872)K±)B(X(3872) J/??) = (1.78+0.48 -0.44±0.12)×10-6, B(B± ! ?c2K±)= (1.11+0.36 -0.34 ± 0.09) × 10-5, B(B± X (3872)K±)B(X(3872) ?'?)
Revised: January 20, 2016 |
Published: August 26, 2011
Citation
Bhardwaj V., K. Trabelsi, J.B. Singh, S. Choi, S.L. Olsen, I. Adachi, and K. Adamczyk, et al. 2011.Observation of X(3872)?J/?? and Search for X(3872)??'? in B Decays.Physical Review Letters 107, no. 9:Article No. 091803.PNNL-SA-81590.doi:10.1103/PhysRevLett.107.091803