On the origin of the narrow peak and the isospin symmetry breaking of the $X$(3872)

Understand

The $X$(3872) formation and decay processes in the $B$-decay are investigated by a $c\bar c$-two-meson hybrid model.

• The two-meson state consists of the $D^0{\bar D}^*{}^0$, $D^+D^{*-}$, $J/\psi\rho$, and $J/\psi\omega$ channels.
• The energy-dependent decay widths of the $\rho$ and $\omega$ mesons are introduced.
• The $D$-${\bar D}^*$ interaction is taken to be consistent with a lack of the $B{\bar B}^*$ bound state.