2014/10/31 by BESIII Collaboration, M. Ablikim, M. N. Achasov +405 · 1 citation
Physics and Astronomy · #hep-ex
paper · pdf · doi:10.1103/physrevlett.114.092003
published as Phys. Rev. Lett. 114, 092003 (2015) · 7 pages, 5 figures
arxiv created 2015/02/04 · arxiv updated 2015/03/11
Based on data samples collected with the BESIII detector at the BEPCII collider at 9 center-of-mass energies from 4.21 to 4.42 GeV, we search for the production of e+e-→ ωχcJ (J=0, 1, 2). The process e+e-→ ωχc0 is observed for the first time, and the Born cross sections at √(s)=4.23 and 4.26 GeV are measured to be (55.4± 6.0± 5.9) and (23.7± 5.3± 3.5) pb, respectively, where the first uncertainties are statistical and the second are systematic. The ωχc0 signals at the other 7 energies and e+e-→ ωχc1 and ωχc2 signals are not significant, and the upper limits on the cross sections are determined. By examining the ωχc0 cross section as a function of center-of-mass energy, we find that it is inconsistent with the line shape of the Y(4260) observed in e+ e-→π+π-J/ψ. Assuming the ωχc0 signals come from a single resonance, we extract mass and width of the resonance to be (4230±8±6) MeV/c2 and (38±12±2) MeV, respectively, and the statistical significance is more than 9σ.