Evidence for a vector charmonium-like state in $e^{+}{e}^{-}\to D_s^{+}{D}_{s2}^{\ast }(2573{)}^{-}+c.c.$

Abstract

We report the measurement of $e^{+}{e}^{-}\to D_s^{+}{D}_{s2}^{\ast }(2573{)}^{-}+c.c.$ via initial-state radiation using a data sample of an integrated luminosity of 921.9 fb${}^{-1}$ collected with the Belle detector at the ${\rm Y}(4S)$ and nearby. We find evidence for an enhancement with a 3.4$\sigma$ significance in the invariant mass of $D_s^{+}{D}_{s2}^{\ast }(2573{)}^{-}+c.c.$ The measured mass and width are $(4619.8_{-8.0}^{+8.9}(stat.)\pm 2.3(syst.))\mathrm{MeV}/c^2$ and $(47.0_{-14.8}^{+31.3}(stat.)\pm 4.6(syst.))\mathrm{MeV}$, respectively. The mass, width, and quantum numbers of this enhancement are consistent with the charmonium-like state at 4626 MeV/$c^2$ recently reported by Belle in $e^{+}{e}^{-}\to D_s^{+}{D}_{s1}(2536{)}^{-}+c.c.$ The product of the $e^{+}{e}^{-}\to D_s^{+}{D}_{s2}^{\ast }(2573{)}^{-}+c.c.$ cross section and the branching fraction of $D_{s2}^{\ast }(2573{)}^{-}\to {\bar{D}}^0{K}^{-}$ is measured from $D_s^{+}{D}_{s2}^{\ast }(2573{)}^{-}$ threshold to 5.6 GeV.

9 pages, 4 figures

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• Observation of a vector charmoniumlike state at 4.7 $\mathrm{GeV}/c^2$ and search for $Z_{cs}$ in $e^{+}{e}^{-}\to K^{+}{K}^{-}J/\psi$
• Observation of resonance structures in $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{\psi }_2(3823)$ and mass measurement of ${\psi }_2(3823)$
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• Measurement of the Born Cross Sections for $e^{+}{e}^{-}\to D_s^{+}{D}_{s1}(2460{)}^{-}+c.c.$ and $e^{+}{e}^{-}\to D_s^{\ast +}{D}_{s1}(2460{)}^{-}+c.c.$
• Study of the hidden charm $D{\bar{D}}^{\ast }$ interactions in chiral effective field theory
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• Cross section measurement of $e^{+}{e}^{-}\to \eta \psi (2S)$ and search for $e^{+}{e}^{-}\to \eta \tilde{X}(3872)$
• Looking for a vector charmonium-like state $Y$ in $e^{+}{e}^{-}\to \bar{D}{D}_1(2420)+c.c.$
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