Evidence for factorization in three-body $\overline B\to D^{(*)}\,K^-\,K^0$ decays

Abstract

Motivated by experimental results on $\overline B\to D^{(*)}K^{-}K^{0}$, we use a factorization approach to study these decays. Two mechanisms concerning kaon pair production arise: current-produced (from vacuum) and transition (from the B meson). The kaon pair in the $\overline B {}^0\to D^{(*)+}K^{-}K^0$ decays can be produced only by the vector current (current-produced), whose matrix element can be extracted from $e^+e^{-}\to K\overline K$ processes via isospin relations. The decay rates obtained this way are in good agreement with experiment. The B^–→ D^(*)0K^– K⁰ decays involve both current-produced and transition processes. By using QCD counting rules and the measured B^–→ D^(*)0 K^– K⁰ decay rates, the measured decay spectra can be understood.

PACS: 13.25.Hw – 14.40.Nd