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Search for the rare decays <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>D</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:mi>h</mml:mi><mml:mo mathvariant="bold" stretchy="false">(</mml:mo><mml:msup><mml:mrow><mml:mi>h</mml:mi></mml:mrow><mml:mrow><mml:mo mathvariant="bold" stretchy="false">(</mml:mo><mml:mo>′</mml:mo><mml:mo mathvariant="bold" stretchy="false">)</mml:mo></mml:mrow></mml:msup><mml:mo mathvariant="bold" stretchy="false">)</mml:mo><…
We search for rare decays of D mesons to hadrons accompanied by an electron-positron pair (h(h('))e+e−), using an e+e− collision sample corresponding to an integrated luminosity of 2.93 fb−1 collected with the BESIII detector at √s=3.773 GeV. No significant signals are observed, and the corresponding upper limits on the branching …