Study of $B \to χ_{cJ} X$ at Belle

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

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