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Observation of e+e−→ηJ/ψe^{+}e^{-} \to \eta J/\psi at center-of-mass energy sqrts=4.009sqrt{s}=4.009 GeV

Collaboration
•
Aug, 2012
7 pages
Published in:
  • Phys.Rev.D 86 (2012) 071101
e-Print:
DOI:
Experiments:
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Abstract: (arXiv)
Using a 478 pb−1^{-1} data sample collected with the BESIII detector operating at the BEPCII storage ring at a center-of-mass energy of s=4.009\sqrt{s}=4.009 GeV, the production of e+e−→ηJψe^{+}e^{-}\to \eta J\psi is observed for the first time with a statistical significance of greater than 10σ10\sigma. The Born cross section is measured to be (32.1±2.8±1.3)(32.1\pm 2.8 \pm 1.3) pb, where the first error is statistical and the second systematic. Assuming the ηJψ\eta J\psi signal is from a hadronic transition of the ψ(4040)\psi(4040), the fractional transition rate is determined to be B(ψ(4040)→ηJψ)=(5.2±0.5±0.2±0.5)×10−3{\cal B}(\psi(4040)\to \eta J\psi)=(5.2\pm 0.5\pm 0.2\pm 0.5)\times 10^{-3}, where the first, second, and third errors are statistical, systematic, and the uncertainty from the ψ(4040)\psi(4040) resonant parameters, respectively. The production of e+e−→π0Jψe^{+}e^{-} \to \pi^0 J\psi is searched for, but no significant signal is observed, and B(ψ(4040)→π0Jψ)<2.8×10−4{\cal B}(\psi(4040)\to \pi^0 J\psi) < 2.8 \times 10^{-4} is obtained at the 90% confidence level.
Note:
  • 7 pages, 5 figures
  • 13.25.Gv
  • 14.40.Pq
  • 13.40.Hq
  • J/psi(3100): associated production
  • cross section: measured
  • branching ratio: upper limit
  • psi(4040): hadronic decay
  • BES
  • experimental results
  • electron positron: annihilation