Observation of the D1(2420)->DPI+PI- decays

Abstract

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

6 pages, 2 figures

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• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Observation of a Narrow Meson Decaying to Ds+pi0 at a Mass of 2.32 GeV/c^2
• Observation of a Narrow Resonance of Mass 2.46 GeV/c^2 Decaying to D_s^*+ pi^0 and Confirmation of the D_sJ^* (2317) State
• Observation of the DsJ(2317) and DsJ(2457) in B decays
• Study of B- => D**0 pi-(D**0 => D(*)+ pi-) decays
• Measurements of the $D_{sJ}$ resonance properties

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