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Evidence for the direct two-photon transition from ψ(3686) to J/ψ

M Ablikim1, M N Achasov, D J Ambrose

  • 1Institute of High Energy Physics, Beijing 100049, People's Republic of China.

Physical Review Letters
|December 11, 2012
PubMed
Summary

Researchers measured the two-photon transition from psi(3686) to J/psi, yielding a branching fraction of (3.1±0.6±1.0)×10⁻⁴. This marks the first such measurement between charmonium states.

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