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Hadronic molecule structure of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Y</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>3940</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Y</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>4140</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>
We report on further evidence that the $Y(3940)$ and the recently observed $Y(4140)$ are heavy hadron molecule states with quantum numbers ${J}^{PC}={0}^{++}$. The $Y(3940)$ state is considered to be a superposition of ${D}^{*+}{D}^{*\ensuremath{-}}$ and ${D}^{*0}\overline{{D}^{*0}}$, while the $Y(4140)$ is a bound state of ${D}_{s}^{*+}$ and ${D}_{s}^{*\ensuremath{-}}$ mesons. For the first …