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Inclusive and exclusive measurements of $$B$$ decays to $$chi_{c1}$$ and $$chi_{c2}$$ at Belle

$$B$$中間子の$$chi_{c1}$$および$$chi_{c2}$$へのinclusiveおよびexclusive測定

Bhardwaj, V.*; 谷田 聖; Belle Collaboration*; 他197名*

Bhardwaj, V.*; Tanida, Kiyoshi; Belle Collaboration*; 197 of others*

We report inclusive and exclusive measurements for $$chi_{c1}$$ and $$chi_{c2}$$ production in $$B$$ decays. We measure $${cal B}(Bto chi_{c1}X)= (3.03pm0.05({rm stat})pm 0.24({rm syst}))times 10^{-3}$$ and $${cal B}(Bto chi_{c2}X)= (0.70 pm 0.06({rm stat}) pm 0.10({rm syst}))times 10^{-3}$$. For the first time, $$chi_{c2}$$ production in exclusive $$B$$ decays in the modes $$B^0 to chi_{c2}pi^-K^+$$ and $$B^+ to chi_{c2}pi^+pi^-K^+$$ has been observed, along with first evidence for the $$B^+ to chi_{c2}pi^+ K_S^0$$ decay mode. For $$chi_{c1}$$ production, we report the first observation in the $$B^+ to chi_{c1}pi^+pi^-K^+$$, $$B^0 to chi_{c1}pi^+pi^-K^0_S$$ and $$B^0 to chi_{c1}pi^0pi^-K^+$$ decay modes. Using these decay modes, we observe a difference in the production mechanism of $$chi_{c2}$$ in comparison to $$chi_{c1}$$ in $$B$$ decays. In addition, we report searches for $$X(3872)$$ and $$chi_{c1}(2P)$$ in the $$B^+ to (chi_{c1}pi^+pi^-)K^+$$ decay mode. The reported results use $$772 times 10^6$$ $$Bbar{B}$$ events collected at the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider.

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