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論文

First search for the $eta_{c2}(1D)$ in decays at Belle

Chilikin, K.*; 谷田聖; Belle Collaboration*; 他194名*

Journal of High Energy Physics (Internet), 2020(5), p.34_1 - 34_22, 2020/05

https://doi.org/10.1007/JHEP05(2020)034

被引用回数：2 パーセンタイル：16.06(Physics, Particles & Fields)

The first dedicated search for the $eta_{c2}(1D)$ is carried out using the decays $B^+ rightarrow eta_{c2}(1D) K^+$ , $B^0 rightarrow eta_{c2}(1D) K^0_S$ , $B^0 rightarrow eta_{c2}(1D) pi^- K^+$ , and $B^+ rightarrow eta_{c2}(1D) pi^+ K^0_S$ with $eta_{c2}(1D) to h_c gamma$ . No significant signal is found. For the $eta_{c2}(1D)$ mass range between and $3845 mathrm{MeV}/c^2$ , the branching-fraction upper limits are determined to be $mathcal{B}(B^+ rightarrow eta_{c2}(1D) K^+) times mathcal{B}(eta_{c2}(1D) to h_c gamma) < 3.7 times 10^{-5}$ , $mathcal{B}(B^0 rightarrow eta_{c2}(1D) K^0_S) times mathcal{B}(eta_{c2}(1D) to h_c gamma) < 3.5 times 10^{-5}$ , $mathcal{B}(B^0 rightarrow eta_{c2}(1D) pi^- K^+) times mathcal{B}(eta_{c2}(1D) to h_c gamma) < 1.0 times 10^{-4}$ , and $mathcal{B}(B^+ rightarrow eta_{c2}(1D) pi^+ K^0_S) times mathcal{B}(eta_{c2}(1D) to h_c gamma) < 1.1 times 10^{-4}$ at 90% C. L. The analysis is based on the 711 $mathrm{fb}^{-1}$ data sample collected on the resonance by the Belle detector, which operated at the KEKB asymmetric-energy collider.

論文

First measurements of absolute branching fractions of the baryon at Belle

Li, Y. B.*; 谷田聖; Belle Collaboration*; 他194名*

Physical Review D, 100(3), p.031101_1 - 031101_8, 2019/08

https://doi.org/10.1103/PhysRevD.100.031101

被引用回数：23 パーセンタイル：78.29(Astronomy & Astrophysics)

We present the first measurements of the absolute branching fractions of decays into and final states. Our analysis is based on a data set of $(772pm 11)times 10^{6}$ pairs collected at the resonance with the Belle detector at the KEKB collider. We measure the absolute branching fraction of $bar{B}^{0} to bar{Lambda}_{c}^{-} Xi_{c}^{+}$ with the recoiling against $bar{Lambda}_c^-$ in $bar{B}^0$ decays resulting in ${cal B}(bar{B}^{0} to bar{Lambda}_{c}^{-} Xi_{c}^{+}) = [1.16 pm 0.42(rm stat.) pm 0.15(rm syst.)] times 10^{-3}$ . We then measure the product branching fractions ${cal B}(bar{B}^{0} to bar{Lambda}_c^- Xi_c^+){cal B}(Xi_c^+ to Xi^- pi^+ pi^+)$ and ${cal B}(bar{B}^{0} to bar{Lambda}_c^- Xi_c^+){cal B}(Xi_c^+ to p K^- pi^+)$ . Dividing these product branching fractions by $bar{B}^{0} to bar{Lambda}_{c}^{-} Xi_{c}^{+}$ yields: ${cal B}(Xi_c^+ to Xi^- pi^+ pi^+) = [2.86 pm 1.21(rm stat.) pm 0.38(rm syst.)]%$ and ${cal B}(Xi_c^+ to p K^- pi^+)=[0.45 pm 0.21(rm stat.) pm 0.07(rm syst.)]%$ . Our result for ${cal B}(Xi_c^+ to Xi^- pi^+ pi^+)$ can be combined with branching fractions measured relative to to set the absolute scale for many branching fractions.