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Search for tetraquark states <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>X</mml:mi><mml:mrow><mml:mi>c</mml:mi><mml:mi>c</mml:mi><mml:mover accent="true"><mml:mi>s</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover><mml:mover accent="true"><mml:mi>s</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover></mml:mrow></mml:msub></mml:math> in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>D</mml:mi…
A search for double-heavy tetraquark state candidates ${X}_{cc\overline{s}\overline{s}}$ decaying to ${D}_{s}^{+}{D}_{s}^{+}$ and ${D}_{s}^{*+}{D}_{s}^{*+}$ is presented for the first time using the data samples of $102\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\mathrm{\ensuremath{\Upsilon}}(1S)$ and $158\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\mathrm{\ensuremath{\Upsilon}}(2S)$ events, and the data samples at $\sqrt{s}=10.52$, 10.58, and 10.867 GeV corresponding to integrated luminosities of 89.5, 711.0, and $121.4\text{ }\text{ …