Measurement of $\mathcal{B}(J/\psi \to {\eta }^{\prime }{e}^{+}{e}^{-}$) and search for a dark photon

Abstract

Using a data sample of $(1310.6\pm 7.0)\times 10^6$ $J/\psi$ decay events collected with the BESIII detector at BEPCII, we study the electromagnetic Dalitz decay $J/\psi \to {\eta }^{\prime }{e}^{+}{e}^{-}$ with two dominant ${\eta }^{\prime }$ decay modes, ${\eta }^{\prime }\to \gamma {\pi }^{+}{\pi }^{-}$ and ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}\eta$. The branching fraction is determined to be $\mathcal{B}(J/\psi \to {\eta }^{\prime }{e}^{+}{e}^{-})=(6.59\pm 0.07\pm 0.17)\times 10^{-5}$, which improves in precision by a factor of 2 over the previous BESIII measurement. A search for the dark photon (${\gamma }^{\prime }$) is performed via $J/\psi \to {\eta }^{\prime }{\gamma }^{\prime },{\gamma }^{\prime }\to e^{+}{e}^{-}$. Excluding the $\omega$ and $\varphi$ mass regions, no significant signal is observed in the mass range from 0.1 to 2.1 GeV/$c^2$. We set upper limits at the 90\% confidence level on $\mathcal{B}(J/\psi \to {\eta }^{\prime }{\gamma }^{\prime })\times \mathcal{B}({\gamma }^{\prime }\to e^{+}{e}^{-})$, $\mathcal{B}(J/\psi \to {\eta }^{\prime }{\gamma }^{\prime }$) and the mixing strength as a function of dark photon mass. This is among the first searches for dark photons in charmonium decays.

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• Search for the massless dark photon with $D^0\to \omega {\gamma }^{\prime }$ and $D^0\to \gamma {\gamma }^{\prime }$
• Search for rare decay $J/\psi \to \varphi e^{+}{e}^{-}$
• Improved measurements of the Dalitz decays $\eta /{\eta }^{\prime }\to \gamma e^{+}{e}^{-}$
• Probing the ATOMKI X17 vector boson using Dalitz decays $V\to P{e}^{+}{e}^{-}$
• Search for light neutral particles decaying promptly into collimated pairs of electrons or muons in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• QCD analysis of the $P$-wave charmonium electromagnetic Dalitz decays $h_c\to {\eta }^{(\prime )}{\ell }^{+}{\ell }^{-}$
• Search for intermediate resonances and dark gauge bosons in $J/\psi \to \gamma {\pi }^0{\eta }^{\prime }$