JOPSS:検索結果一覧

検索結果：　3 件中 1件目～3件目を表示

発表形式

Initialising ...

選択項目を絞り込む

掲載資料名

Initialising ...

発表会議名

Initialising ...

筆頭著者名

Initialising ...

キーワード

Initialising ...

発表言語

Initialising ...

発行年

Initialising ...

開催年

Initialising ...

論文

Evidence of a new excited charmed baryon decaying to $Sigma_{c}(2455)^{0,++} pi^{pm}$

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

Physical Review Letters, 130(3), p.031901_1 - 031901_7, 2023/01

https://doi.org/10.1103/PhysRevLett.130.031901

被引用回数：17 パーセンタイル：89.99(Physics, Multidisciplinary)

We present the study of $bar{B}^{0} to Sigma_{c}(2455)^{0,++} pi^{pm} bar{p}$ decays based on $772times 10^{6}$ events collected with the Belle detector at the KEKB asymmetric-energy collider. The $Sigma_{c}(2455)^{0,++}$ candidates are reconstructed via their decay to $Lambda_{c}^{+} pi^{mp}$ and $Lambda_{c}^{+}$ decays to $pK^{-}pi^{+},~pK_{S}^{0},$ and $Lambdapi^{+}$ final states. The corresponding branching fractions are measured to be ${cal B}(bar{B}^{0} to Sigma_{c}(2455)^{0} pi^{+} bar{p}) = (1.09 pm 0.06 pm 0.07)times10^{-4}$ and ${cal B}(bar{B}^{0} to Sigma_{c}(2455)^{++} pi^{-} bar{p}) = (1.84pm 0.11 pm 0.12)times 10^{-4}$ , which are consistent with the world average values with improved precision. A new structure is found in the $M_{Sigma_{c}(2455)^{0,++}pi^{pm}}$ spectrum with a significance of including systematic uncertainty. The structure is possibly an excited $Lambda_{c}^{+}$ and is tentatively named $Lambda_{c}(2910)^{+}$ . Its mass and width are measured to be MeV/ $c^{2}$ and MeV, respectively. The products of branching fractions for the $Lambda_{c}(2910)^{+}$ are measured to be ${cal B}(bar{B}^{0} to Lambda_{c}(2910)^{+}bar{p})times{cal B}(Lambda_{c}(2910)^{+} to Sigma_{c}(2455)^{0}pi^{+}) = (9.5 pm 3.6 pm 1.6)times 10^{-6}$ and ${cal B}(bar{B}^{0} to Lambda_{c} (2910)^{+}bar{p})times {cal B}(Lambda_{c}(2910)^{+} to Sigma_{c}(2455)^{++}pi^{-}) = (1.24 pm 0.35 pm 0.10)times 10^{-5}$ . Here, the first and second uncertainties are statistical and systematic, respectively.

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：4 パーセンタイル：22.97(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：28 パーセンタイル：76.19(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.