Observation of $e^{+}{e}^{-}\to D_s^{+}\overline{D}{}^{(\ast )0}{K}^{-}$ and study of the $P$-wave $D_s$ mesons

Abstract

Studies of $e^{+}{e}^{-}\to D_s^{+}\overline{D}{}^{(\ast )0}{K}^{-}$ and the $P$-wave charmed-strange mesons are performed based on an $e^{+}{e}^{-}$ collision data sample corresponding to an integrated luminosity of 567 pb${}^{-1}$ collected with the BESIII detector at $\sqrt{s}=4.600$ GeV. The processes of $e^{+}{e}^{-}\to D_s^{+}\overline{D}{\ast }^0{K}^{-}$ and $D_s^{+}\overline{D}{}^0{K}^{-}$ are observed for the first time and are found to be dominated by the modes $D_s^{+}{D}_{s1}(2536{)}^{-}$ and $D_s^{+}{D}_{s2}^{\ast }(2573{)}^{-}$, respectively. The Born cross sections are measured to be ${\sigma }^B(e^{+}{e}^{-}\to D_s^{+}\overline{D}{\ast }^0{K}^{-})=(10.1\pm 2.3\pm 0.8)pb$ and ${\sigma }^B(e^{+}{e}^{-}\to D_s^{+}\overline{D}{}^0{K}^{-})=(19.4\pm 2.3\pm 1.6)pb$, and the products of Born cross section and the decay branching fraction are measured to be ${\sigma }^B(e^{+}{e}^{-}\to D_s^{+}{D}_{s1}(2536{)}^{-}+c.c.)\cdot \mathcal{B}(D_{s1}(2536{)}^{-}\to \overline{D}{\ast }^0{K}^{-})=(7.5\pm 1.8\pm 0.7)pb$ and ${\sigma }^B(e^{+}{e}^{-}\to D_s^{+}{D}_{s2}^{\ast }(2573{)}^{-}+c.c.)\cdot \mathcal{B}(D_{s2}^{\ast }(2573{)}^{-}\to \overline{D}{}^0{K}^{-})=(19.7\pm 2.9\pm 2.0)pb$. For the $D_{s1}(2536{)}^{-}$ and $D_{s2}^{\ast }(2573{)}^{-}$ mesons, the masses and widths are measured to be $M(D_{s1}(2536{)}^{-})=(2537.7\pm 0.5\pm 3.1)MeV/c^2,$ $\Gamma (D_{s1}(2536{)}^{-}))=(1.7\pm 1.2\pm 0.6)\mathrm{MeV},$ and $M(D_{s2}^{\ast }(2573{)}^{-})=(2570.7\pm 2.0\pm 1.7)MeV/c^2,$ $\Gamma (D_{s2}^{\ast }(2573{)}^{-})=(17.2\pm 3.6\pm 1.1)MeV.$ The spin-parity of the $D_{s2}^{\ast }(2573{)}^{-}$ meson is determined to be $J^P=2^{+}$. In addition, the process $e^{+}{e}^{-}\to D_s^{+}\overline{D}{}^{(\ast )0}{K}^{-}$ are searched for using the data samples taken at four (two) center-of-mass energies between 4.416 (4.527) and 4.575 GeV, and upper limits at the $90\%$ confidence level on the cross sections are determined.

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Cited by in corpus (7)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• Observation of a near-threshold structure in the $K^{+}$ recoil-mass spectra in $e^{+}{e}^{-}\to K^{+}(D_s^{-}{D}^{\ast 0}+D_s^{\ast -}{D}^0)$
• Evidence for a neutral near-threshold structure in the $K_{\mathrm{S}}^0$ recoil-mass spectra in $e^{+}{e}^{-}\to K_{\mathrm{S}}^0{D}_s^{+}{D}^{\ast -}$ and $e^{+}{e}^{-}\to K_{\mathrm{S}}^0{D}_s^{\ast +}{D}^{-}$
• Evidence for a vector charmonium-like state in $e^{+}{e}^{-}\to D_s^{+}{D}_{s2}^{\ast }(2573{)}^{-}+c.c.$
• Colloquium: Hadron Production in Open-charm Meson Pair at $e^{+}{e}^{-}$ Collider
• Measurements of Born Cross Sections of $e^{+}{e}^{-}\to D_s^{\ast +}{D}_{sJ}^{-}+c.c.$
• Measurement of the Born Cross Sections for $e^{+}{e}^{-}\to D_s^{+}{D}_{s1}(2460{)}^{-}+c.c.$ and $e^{+}{e}^{-}\to D_s^{\ast +}{D}_{s1}(2460{)}^{-}+c.c.$