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Search for lepton-number-violating<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mo mathvariant="bold">+</mml:mo></mml:msup><mml:mo mathvariant="bold">→</mml:mo><mml:msup><mml:mi>D</mml:mi><mml:mo mathvariant="bold">−</mml:mo></mml:msup><mml:msup><mml:mi>ℓ</mml:mi><mml:mo mathvariant="bold">+</mml:mo></mml:msup><mml:msup><mml:mi>ℓ</mml:mi><mml:mrow><mml:mo>′</mml:mo><mml:mo mathvariant="bold">+</mml:mo></mml:mrow></mml:msup></mml:math>…
We perform the first search for lepton-number-violating B+->D-l+l'+ decays, where l and l' stand for e or mu, using 772 x 10^6 BB-bar pairs accumulated at the Upsilon(4S) resonance with the Belle detector at the KEKB e^+e^- collider. No evidence for these decays has been found. Assuming uniform three-body phase …