Study of $B\to {\chi }_{cJ}X$ at Belle

In spite of the fact that the two-body $B$ decays into ${\chi }_{c2}$ such as $B \to \chi_{c2} K^{(*)}$ are suppressed by the QCD factorization effect, the inclusive $B\to {\chi }_{c2}X$ branching fraction amounts to one third of the non-suppressed $B\to {\chi }_{c1}X$ decays because of the decay modes to the multi-body final states. Using a large statistics $\mathrm{{\rm Y}}(4S)$ data sample corresponding to 772 million $B$ meson pairs accumulated by the Belle detector at the KEKB $e^{+}{e}^{-}$ collider, precise measurements of inclusive $B \to \chi_{c1}$and$\chi_{c2}$ branching fractions are carried out. The multi-body final states such as ${\chi }_{cJ}K\pi$, ${\chi }_{cJ}K\pi \pi$ and so on are also investigated to look for new charmonium-like resonance.