Observation of $\psi (3686)\to e^{+}{e}^{-}{\chi }_{cJ}$ and ${\chi }_{cJ}\to e^{+}{e}^{-}J/\psi$

Abstract

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

References in corpus (5)

• The Spin-orbit force, recoil corrections and possible $B{\bar{B}}^{\ast }$ and $D{\bar{D}}^{\ast }$ molecular states
• Observation of $e^{+}{e}^{-}\to \omega {\chi }_{c1,2}$ near $\sqrt{s}$ = 4.42 and 4.6 GeV
• Observation of $h_c$ radiative decay $h_c\to \gamma {\eta }^{\prime }$ and evidence for $h_c\to \gamma \eta$
• Measurement of higher-order multipole amplitudes in $\psi (3686)\to \gamma {\chi }_{c1,2}$ with ${\chi }_{c1,2}\to \gamma J/\psi$ and search for the transition ${\eta }_c(2S)\to \gamma J/\psi$
• Open charm contributions to the E1 transitions of $\psi (3686)$ and $\psi (3770)\to \gamma {\chi }_{cJ}$

Cited by in corpus (8)

• Cross section measurements of $e^{+}{e}^{-}\to \omega {\chi }_{c0}$ from $\sqrt{s}=$4.178 to 4.278 GeV
• Cross section measurement of $e^{+}{e}^{-}\to {\eta }^{\prime }J/\psi$ from $\sqrt{s}=4.178$ to $4.600$ GeV
• ${\chi }_{c1}$ and ${\chi }_{c2}$ resonance parameters with the decays ${\chi }_{c1,c2}\to J/\psi {\mu }^{+}{\mu }^{-}$
• Muon Pair Production in Radiative Decays of Heavy Quarkonia
• Observation of $\psi (3686)\to {\eta }^{\prime }{e}^{+}{e}^{-}$
• Study of electromagnetic Dalitz decays ${\chi }_{cJ}\to {\mu }^{+}{\mu }^{-}J/\psi$
• Observation of the hindered electromagnetic Dalitz decay $\psi (3686)\to e^{+}{e}^{-}{\eta }_c$
• Observation of the electromagnetic Dalitz decay $D^{\ast 0}\to D^0{e}^{+}{e}^{-}$