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Study of the decays<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mo>→</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mo>(</mml:mo><mml:mi>*</mml:mi><mml:mo>)</mml:mo><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mo>(</mml:mo><mml:mi…
The decays B0→D*+D*−, B0→D*±D∓ and B0→D+D− are studied in 9.7×106Υ(4S)→B¯B decays accumulated with the CLEO detector. We determine B(B0→D*+D*−)=(9.9+4.2−3.3[stat]±1.2[syst])×10−4 and limit B(B0→D*±D∓)<6.3×10−4 and B(B0→D+D−)<9.4×10−4 at 90% confidence level (C.L.). We also perform the first angular analysis of the B0→D*+D*− decay and determine that the CP-even fraction of the final state …