Observation of e+e−→ϕχc1 and ϕχc2 at s=4.600 GeV
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Abstract
Using a data sample collected with the BESIII detector operating at the BEPCII storage ring at a center-of-mass energy of $\sqrt{s}=4.600\text{ }\text{ }\mathrm{GeV}$, we search for the production of ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\chi}}_{c0,1,2}$. A search is also performed for the charmonium-like state $X(4140)$ in the radiative transition ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\gamma}X(4140)$ with $X(4140)$ subsequently decaying into $\ensuremath{\phi}J/\ensuremath{\psi}$. The processes ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\chi}}_{c1}$ and $\ensuremath{\phi}{\ensuremath{\chi}}_{c2}$ are observed for the first time, each with a statistical significance of more than $10\ensuremath{\sigma}$, and the Born cross sections are measured to be ($4.{2}_{\ensuremath{-}1.0}^{+1.7}\ifmmode\pm\else\textpm\fi{}0.3$) and $(6.{7}_{\ensuremath{-}1.7}^{+3.4}\ifmmode\pm\else\textpm\fi{}0.5)\text{ }\text{ }\mathrm{pb}$, respectively, where the first uncertainties are statistical and the second systematic. No significant signals are observed for ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\chi}}_{c0}$ and ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\gamma}X(4140)$ and upper limits on the Born cross sections at 90% C.L. are provided at $\sqrt{s}=4.600\text{ }\text{ }\mathrm{GeV}$.
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