Observation of $e^{+}{e}^{-}\to K\bar{K}J/\psi$ at center-of-mass energies from 4.189 to 4.600 GeV

Abstract

We investigate the process $e^{+}{e}^{-}\to K\bar{K}J/\psi$ at center-of-mass energies from 4.189 to 4.600 GeV using 4.7 fb${}^{-1}$ of data collected by the BESIII detector at the BEPCII collider. The Born cross sections for the reactions $e^{+}{e}^{-}\to K^{+}{K}^{-}J/\psi$ and $K_S^0{K}_S^{0}J/\psi$ are measured as a function of center-of-mass energy. The energy dependence of the cross section for $e^{+}{e}^{-}\to K^{+}{K}^{-}J/\psi$ is shown to differ from that for ${\pi }^{+}{\pi }^{-}J/\psi$ in the region around the $Y(4260)$. In addition, there is evidence for a structure around 4.5 GeV in the $e^{+}{e}^{-}\to K^{+}{K}^{-}J/\psi$ cross section that is not present in ${\pi }^{+}{\pi }^{-}J/\psi$.

arXiv comment8 pages, 3 figures

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• Observation of $e^{+}{e}^{-}\to {\eta }^{\prime }J/\psi$ at center-of-mass energies between 4.189 and 4.600 GeV

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• Strange molecular partners of the $Z_c(3900)$ and $Z_c(4020)$
• Observation of the $Y(4230)$ and a new structure in $e^{+}{e}^{-}\to K^{+}{K}^{-}J/\psi$
• Nature of the $Y(4260)$: A light-quark perspective
• Observation of the $Y(4230)$ and evidence for a new vector charmonium-like state $Y(4710)$ in $e^{+}{e}^{-}\to K_S^0{K}_S^{0}J/\psi$
• Photoproduction of strange hidden-charm and hidden-bottom states
• Production of $Z_{cs}$ in $B$ and $B_s$ decay
• The impact of $S$-wave thresholds $D_{s1}{\bar{D}}_s+c.c.$ and $D_{s0}{\bar{D}}_s^{\ast }+c.c.$ on vector charmonium spectrum
• Are the XYZ states unconventional states or conventional states with unconventional properties?
• $e^{+}{e}^{-}\to {\Lambda }_c^{+}{\bar{\Lambda }}_c^{-}$ cross sections and the ${\Lambda }_c^{+}$ electromagnetic form factors within the extended vector meson dominance model
• Simultaneous description of the $e^{+}{e}^{-}\to J/\psi \pi \pi (K\bar{K})$ processes
• On the origin of the $Y(4260)$
• $S$ wave hidden charm - hidden strangeness production in $e^{+}{e}^{-}$ annihilation
• Ballistic Lévy walk with rests: Escape from a bounded domain
• Study of $e^{+}{e}^{-}\to h^{+}{h}^{-}J/\psi (h=\pi ,K,p)$ via initial-state radiation at Belle~II