English

\psi(2S) Decays into $\J$ plus Two Photons

High Energy Physics - Experiment 2012-08-27 v1

Abstract

Using γγJ/ψ,J/ψ\rae+e\gamma \gamma J/\psi, J/\psi \ra e^+ e^- and μ+μ\mu^+ \mu^- events from a sample of 14.0×10614.0\times 10^6 \psip\psip decays collected with the BESII detector, the branching fractions for \psip\raπ0\J\psip\ra \pi^0\J, η\J\eta\J, and ψ(2S)\arγχc1,γχc2\arγγ\jpsi\psi(2S)\ar\gamma\chi_{c1},\gamma\chi_{c2}\ar\gamma\gamma\jpsi are measured to be B(\psip\raπ0\J)=(1.43±0.14±0.13)×103B(\psip\ra \pi^0\J) = (1.43\pm0.14\pm0.13)\times 10^{-3}, B(\psip\raη\J)=(2.98±0.09±0.23)B(\psip\ra \eta\J) = (2.98\pm0.09\pm0.23)%, B(ψ(2S)\arγχc1\arγγ\jpsi)=(2.81±0.05±0.23)B(\psi(2S)\ar\gamma\chi_{c1}\ar\gamma\gamma\jpsi) = (2.81\pm0.05\pm 0.23)%, and B(ψ(2S)\arγχc2\arγγ\jpsi)=(1.62±0.04±0.12)B(\psi(2S)\ar\gamma\chi_{c2}\ar\gamma\gamma\jpsi) = (1.62\pm0.04\pm 0.12)%.

Keywords

Cite

@article{arxiv.hep-ex/0403023,
  title  = {\psi(2S) Decays into $\J$ plus Two Photons},
  author = {BES collaboration},
  journal= {arXiv preprint arXiv:hep-ex/0403023},
  year   = {2012}
}

Comments

7 pages, 6 figures. submitted to Phys. Rev. D

R2 v1 2026-07-22T13:03:20.159Z