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• W4313404107 abstract "Abstract We report a search for a heavier partner of the recently observed <?CDATA $ Z_{cs}(3985)^{-} $?> state, denoted as <?CDATA $ Z_{cs}^{prime -} $?> , in the process <?CDATA $ e^{+} e^{-}rightarrow K^{+}D_{s}^{*-}D^{* 0}+c.c. $?> , based on <?CDATA $ e^+e^- $?> collision data collected at the center-of-mass energies of <?CDATA $ sqrt{s}=4.661 $?> , 4.682 and 4.699 GeV with the BESIII detector. The <?CDATA $ Z_{cs}^{prime -} $?> is of interest as it is expected to be a candidate for a hidden-charm and open-strange tetraquark. A partial-reconstruction technique is used to isolate <?CDATA $ K^+ $?> recoil-mass spectra, which are probed for a potential contribution from <?CDATA $ Z_{cs}^{prime -}to D_{s}^{*-}D^{* 0} $?> ( <?CDATA $ c.c. $?> ). We find an excess of <?CDATA $ Z_{cs}^{prime -}rightarrow D_{s}^{*-}D^{*0} $?> ( <?CDATA $ c.c. $?> ) candidates with a significance of <?CDATA $ 2.1sigma $?> , after considering systematic uncertainties, at a mass of <?CDATA $ (4123.5pm0.7_mathrm{stat.}pm4.7_mathrm{syst.}) ,mathrm{MeV}/c^2 $?> . As the data set is limited in size, the upper limits are evaluated at the 90% confidence level on the product of the Born cross sections ( <?CDATA $ sigma^{mathrm{Born}} $?> ) and the branching fraction ( <?CDATA $ mathcal{B} $?> ) of <?CDATA $ Z_{cs}^{prime-}rightarrow D_{s}^{*-}D^{* 0} $?> , under different assumptions of the <?CDATA $ Z_{cs}^{prime -} $?> mass from 4.120 to 4.140 MeV and of the width from 10 to 50 MeV at the three center-of-mass energies. The upper limits of <?CDATA $ sigma^{rm Born}cdotmathcal{B} $?> are found to be at the level of <?CDATA $ mathcal{O}(1) $?> pb at each energy. Larger data samples are needed to confirm the <?CDATA $ Z_{cs}^{prime -} $?> state and clarify its nature in the coming years." @default.
• W4313404107 created "2023-01-06" @default.
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