Evidence for the Direct Two-Photon Transition from $ψ'$ to $J/ψ$

Details Evidence for the Direct Two-Photon Transition from $ψ'$ to $J/ψ$ Evidence for the Direct Two-Photon Transition from $ψ'$ to $J/ψ$

2012-04-01

arxiv.org/abs/1204.0246v1

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 3 figures, 2 tables

Scientific paper

The two-photon transition $\psi' \to \gamma\gamma J/\psi$ is studied in a sample of 106 million $\psi'$ decays collected by the BESIII detector. The branching fraction is measured to be $(3.3\pm0.6(\unit{stat})^{+0.8}_{-1.1}(\unit{syst})) \times10^{-4}$ using $J/\psi \to e^+e^-$ and $J/\psi \to \mu^+\mu^-$decays. This work represents the first measurement of a two-photon transition among charmonium states. The orientation of the $\psi'$ decay plane and the $J/\psi$ polarization in this decay are also studied. In addition, the product branching fractions of sequential $E1$ transitions $\psi'\to\gamma\chi_{cJ}$, $\chi_{cJ}\to\gamma J/\psi (J=0,1,2)$ are reported.

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