Evidence for Factorization in Three-body $\bar{B}\to D^{(\ast )}{K}^{-}{K}^0$ Decays

Abstract

Motivated by experimental results on $\bar{B}\to D^{(\ast )}{K}^{-}{K}^0$, 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 $\bar{B}{}^0\to D^{(\ast )+}{K}^{-}{K}^0$ decays can be produced only by the vector current (current-produced), whose matrix element can be extracted from $e^{+}{e}^{-}\to K\bar{K}$ processes via isospin relations. The decay rates obtained this way are in good agreement with experiment. The $B^{-}\to D^{(\ast )0}{K}^{-}{K}^0$ decays involve both current-produced and transition processes. By using QCD counting rules and the measured $B^{-}\to D^{(\ast )0}{K}^{-}{K}^0$ decay rates, the measured decay spectra can be understood.

Comments: 3 pages, 6 figures. Talk presented at EPS2003 Conference, Aachen, Germany, July 2003