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Evidence for psi' decays into gamma pi^0 and gamma eta

High Energy Physics - Experiment 2012-08-27 v1
Authors: The BESIII Collaboration
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Abstract

The decays psi'->gamma pi^0, gamma eta and gamma eta' are studied using data collected with the BESIII detector at the BEPCII e^+e^- collider. Processes psi'->gamma pi^0 and psi'->gamma eta are observed for the first time with signal significances of 4.6 sigma and 4.3 sigma, respectively. The branching fractions are determined to be: B(psi'->gamma pi^0)=(1.58+-0.40+-0.13)x10^{-6}, B(psi'->gamma eta)=(1.38+-0.48+-0.09)x10^{-6}, and B(psi'->gamma eta')=(126+-3+-8) x 10^{-6}, where the first errors are statistical and the second ones systematic.

Keywords

psi' decays radiative decays branching fractions BESIII charmonium

Cite

@article{arxiv.1011.0885,
  title  = {Evidence for psi' decays into gamma pi^0 and gamma eta},
  author = {The BESIII Collaboration},
  journal= {arXiv preprint arXiv:1011.0885},
  year   = {2012}
}

Comments

6 pages, 4 figures

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