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Mohanty, S.*; 谷田 聖; Belle Collaboration*; 他184名*
Physical Review D, 103(5), p.052013_1 - 052013_9, 2021/03
被引用回数:0 パーセンタイル:0.00(Astronomy & Astrophysics)We report the measurement of branching fractions and -violation asymmetries in decays based on a data sample containing events. The data were recorded at the resonance with the Belle detector at the KEKB asymmetric-energy collider. For , the branching fraction and -violation asymmetry measured below the threshold () are and , respectively. Similarly, the branching fraction obtained for below the threshold is . We also measure the -violation asymmetry for within the region () to be .
早川 修平; 藤田 真奈美; 長谷川 勝一; 橋本 直; 細見 健二; 市川 裕大; 今井 憲一*; 七村 拓野; 成木 恵; 佐甲 博之; et al.
Physical Review Letters, 126(6), p.062501_1 - 062501_6, 2021/02
被引用回数:41 パーセンタイル:94.79(Physics, Multidisciplinary)In an emulsion-counter hybrid experiment performed at J-PARC, a absorption event was observed which decayed into twin single- hypernuclei. Kinematic calculations enabled a unique identification of the reaction process as NBe + He. For the binding energy of the hyperon in the -N system a value of MeV was deduced. The energy level of is likely a nuclear state which indicates a weak - coupling.
Paul, N.*; Obertelli, A.*; Bertulani, C. A.*; Corsi, A.*; Doornenbal, P.*; Rodriguez-Sanchez, J. L.*; Authelet, G.*; Orlandi, R.; 他84名*
Physical Review Letters, 122(16), p.162503_1 - 162503_7, 2019/04
被引用回数:7 パーセンタイル:49.42(Physics, Multidisciplinary)Fifty-five single nucleon removal cross sections from neutron-rich nuclei impinging on a hydrogen target at about 250 MeV/nucleon were measured at the RIKEN RIBF. Systematically higher cross sections are found for proton removal from nuclei with an even number of protons compared to odd-proton number projectiles for the same separation energy, while no even-odd staggering was observed in case of neutron-removal. These observations are linked to paring correlations in the daughter nuclei and the density of bound levels. The effect is particularly strong in loosely bound nuclei.
住浜 水季*; 谷田 聖; Belle Collaboration*; 他184名*
Physical Review Letters, 122(7), p.072501_1 - 072501_7, 2019/02
被引用回数:29 パーセンタイル:83.57(Physics, Multidisciplinary)We report the first observation of the doubly-strange baryon in its decay to via decays based on a data sample collected with the Belle detector at the KEKB asymmetric-energy collider. The mass and width are measured to be 1610.4 6.0 (stat) (syst) MeV and 59.9 4.8 (stat) (syst) MeV, respectively. We obtain 4.0 evidence of the with the same data sample. These results shed light on the structure of hyperon resonances with strangeness .
Julius, T.*; 谷田 聖; Belle Collaboration*; 他184名*
Physical Review D, 96(3), p.032007_1 - 032007_8, 2017/08
被引用回数:11 パーセンタイル:47.83(Astronomy & Astrophysics)We measure the branching fraction and -violating asymmetry in the decay , using a data sample of pairs collected at the resonance with the Belle detector at the KEKB collider. The obtained branching fraction and direct asymmetry are and , respectively. The signal significance, including the systematic uncertainty, is 6.4 standard deviations. We combine these results with Belle's earlier measurements of and to exclude the -violating parameter from the range at 95% confidence.