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Search for a doubly charged <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>D</mml:mi><mml:mi>D</mml:mi><mml:mi>K</mml:mi></mml:math> bound state in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">ϒ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>1</mml:mn><mml:mi>S</mml:mi><mml:mo>,</mml:mo><mml:mtext> </mml:mtext><mml:mn>2</mml:mn><mml:mi>S</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:math> …
We report the results of a first search for a doubly charged $DDK$ bound state, denoted the ${R}^{++}$, in $\mathrm{\ensuremath{\Upsilon}}(1S)$ and $\mathrm{\ensuremath{\Upsilon}}(2S)$ inclusive decays and via direct production in ${e}^{+}{e}^{\ensuremath{-}}$ collisions at $\sqrt{s}=10.520$, 10.580, and 10.867 GeV. The search uses data accumulated with the Belle detector at the KEKB asymmetric-energy …