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論文

Search for and decay into $chi_{c1} pi^0$ in decays at Belle

Bhardwaj, V.*; 谷田聖; Belle Collaboration*; 他191名*

Physical Review D, 99(11), p.111101_1 - 111101_8, 2019/06

https://doi.org/10.1103/PhysRevD.99.111101

被引用回数：8 パーセンタイル：40.94(Astronomy & Astrophysics)

We report a search for and in $B^+ to chi_{c1} pi^0 K^+$ decays. We set an upper limit of $mathcal{B}(B^+ to X(3872) K^+) times mathcal{B}(X(3872) to chi_{c1} pi^0)$ $< 8.1 times 10^{-6}$ and $mathcal{B}(B^+ to X(3915) K^+) times mathcal{B}(X(3915) to chi_{c1} pi^0)$ $< 3.8 times 10^{-5}$ at 90% confidence level. We also measure $mathcal{B}(X(3872) to chi_{c1} pi^0)/mathcal{B}(X(3872) to J/psi pi^+ pi^-) < 0.97$ at 90% confidence level. The results reported here are obtained from $772 times 10^{6}$ events collected at the resonance with the Belle detector at the KEKB asymmetric-energy collider.

論文

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

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

Physical Review D, 93(5), p.052016_1 - 052016_13, 2016/03

AA2016-0389.pdf:0.59MB

https://doi.org/10.1103/PhysRevD.93.052016

被引用回数：20 パーセンタイル：66.92(Astronomy & Astrophysics)

We report inclusive and exclusive measurements for $chi_{c1}$ and $chi_{c2}$ production in 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 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 decays. In addition, we report searches for and $chi_{c1}(2P)$ in the $B^+ to (chi_{c1}pi^+pi^-)K^+$ decay mode. The reported results use events collected at the resonance with the Belle detector at the KEKB asymmetric-energy collider.