Study of the electromagnetic Dalitz decays $\psi ({\rm Y})\to {\eta }_c({\eta }_b)l^{+}{l}^{-}$

Abstract

We study the electromagnetic Dalitz (EM) decays, $\psi \to {\eta }_c{l}^{+}{l}^{-}$ and ${\rm Y}\to {\eta }_b{l}^{+}{l}^{-}$ ($l=e$ or $\mu$), in which the lepton pair comes from the virtual photon emitted by the M1 transition from $c\bar{c}$ ($b\bar{b}$) spin triplet state to the spin singlet state. We estimate the partial width of $\psi ({\rm Y})\to {\eta }_c({\eta }_b)l^{+}{l}^{-}$, based on the simple pole approximation. Besides, based on different QCD models, the partial width of $\psi ({\rm Y})\to {\eta }_c({\eta }_b)\gamma$ is determined.

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Cited by in corpus (11)

• Precise determination of decay rates for ${\eta }_c\to \gamma \gamma$, $J/\psi \to \gamma {\eta }_c$ and $J/\psi \to {\eta }_c{e}^{+}{e}^{-}$ from lattice QCD
• Search for new light vector boson using $J/\Psi$ at BESIII and Belle II
• Observation of $J/\psi$ Electromagnetic Dalitz Decays to $X(1835)$, $X(2120)$ and $X(2370)$
• Observation of the hindered electromagnetic Dalitz decay $\psi (3686)\to e^{+}{e}^{-}{\eta }_c$
• Measurement of the absolute branching fractions of Jpsi to gamma eta and eta decay modes
• Study of the electromagnetic Dalitz decay $J/\psi \to e^{+}{e}^{-}{\pi }^0$
• Improved measurements of the Dalitz decays $\eta /{\eta }^{\prime }\to \gamma e^{+}{e}^{-}$
• Probing the ATOMKI X17 vector boson using Dalitz decays $V\to P{e}^{+}{e}^{-}$
• Electromagnetic Dalitz Decays of $D_{(s)}^{\ast }$ Mesons
• QCD analysis of the $P$-wave charmonium electromagnetic Dalitz decays $h_c\to {\eta }^{(\prime )}{\ell }^{+}{\ell }^{-}$
• Radiative and Dalitz decays of ${\rm Y}(1S)$ in the light of the ATOMKI X17 anomaly