Charge asymmetry in decays B → DD¯ K

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We discusses the charge asymmetry in B →DD¯ K decays with an invariant mass of the DD¯ pair near the Ψ(3770) resonance. Unlike Ψ(3770) decays in e+e annihilation, in B+ decays the probability of DD¯ production is almost three times higher than D+D. In B0 decays, the ratio of these probabilities will be opposite. The effect is explained by the fact that, in B-meson decays, the DD¯ pair is produced in a superposition of isoscalar and isovector states, and only in combination with K-mesons the total state has 1/2 isospin. We present a simple model in which the interference of the nonresonant isovector amplitude with the resonant isoscalar amplitude explains the experimental data.

Original languageEnglish
Article number15
Number of pages10
JournalJournal of High Energy Physics
Issue number12
Publication statusPublished - Dec 2020


  • B physics
  • e+-e- Experiments
  • Quarkonium
  • e plus -e- Experiments


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