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Observation of $ψ(3686) → e^{+}e^{-}χ_{cJ}$ and $χ_{cJ} → e^{+}e^{-}J/ψ$

Published in 2017 by M. Ablikim, M. N. Achasov, X. C. Ai, O. Albayrak, M. Albrecht, D. J. Ambrose, A. Amoroso, F. F. An, Q. An, J. Z. Bai, R. Baldini Ferroli, Y. Ban, D. W. Bennett, J. Bennett, M. Bertani and other authors.
This paper is available in a repository.
This paper is available in a repository.

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Abstract

Using $4.479 \times 10^{8}$ $ψ(3686)$ events collected with the BESIII detector, we search for the decays $ψ(3686) → e^{+}e^{-}χ_{c0,1,2}$ and $χ_{c0,1,2} → e^{+}e^{-}J/ψ$. The decays $ψ(3686) → e^{+}e^{-}χ_{c0,1,2}$ and $χ_{c0,1,2} → e^{+}e^{-}J/ψ$ are observed for the first time. The measured branching fractions are $\mathcal{B}(ψ(3686) → e^{+}e^{-}χ_{c0,1,2}) = (11.7 ± 2.5 ± 1.0)\times10^{-4}$, $(8.6 ± 0.3 ± 0.6)\times10^{-4}$, $(6.9 ± 0.5 ± 0.6)\times10^{-4}$, and $\mathcal{B}(χ_{c0,1,2} → e^{+}e^{-}J/ψ) = (1.51 ± 0.30 ± 0.13)\times10^{-4}$, $(3.73 ± 0.09 ± 0.25)\times10^{-3}$, $(2.48 ± 0.08 ± 0.16)\times10^{-3}$. The ratios of the branching fractions $\frac{\mathcal{B}(ψ(3686) → e^{+}e^{-}χ_{c0,1,2})}{\mathcal{B}(ψ(3686) → γχ_{c0,1,2})}$ and $\frac{\mathcal{B}(χ_{c0,1,2} → e^{+}e^{-}J/ψ)}{\mathcal{B}(χ_{c0,1,2} → γ J/ψ)}$ are also reported.