Search for hidden-charm tetraquark with strangeness in *

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