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We report on the first observation of $D_1\to D\pi^+\pi^-$ decays (where thecontribution from the dominant known $D_1 \to D^* \pi$ decay mode is excluded)in the $B\to D_1\pi$ decays. The observation is based on $15.2\times 10^7B\bar{B}$ events collected with the Belle detector at the KEKB collider. Wealso set 90% confidence level upper limits for the $D_2^*\to D^{(*)}\pi^+\pi^-$and $D_1 \to D^*\pi^+\pi^-$ decays in the $B\to D^*_2\pi$ and $B\to D_1\pi$decays, respectively.Comment: 6 pages, 2 figure

physical review letters

Observation of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>D</mml:mi><mml:mn>1</mml:mn></mml:msub><mml:mo stretchy="false">(</mml:mo><mml:mn>2420</mml:mn><mml:mo stretchy="false">)</mml:mo><mml:mo>→</mml:mo><mml:mi>D</mml:mi><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>Decays

Observation of theD1(2420)→Dπ+π−Decays