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Li, Y. B.*; 谷田 聖; Belle Collaboration*; 他182名*
Physical Review Letters, 127(12), p.121803_1 - 121803_8, 2021/09
被引用回数:27 パーセンタイル:92.17(Physics, Multidisciplinary)Using data samples of 89.5 and 711 fb recorded at energies of and GeV, respectively, with the Belle detector at the KEKB collider, we report measurements of branching fractions of semileptonic decays ( or ) and the -asymmetry parameter of decay. The branching fractions are measured to be )=()% and )=()%, and the decay parameter is measured to be with much improved precision compared to the current world average. The corresponding ratio / is 1.03 0.05 0.07, which is consistent with the expectation of lepton flavor universality. The first measured asymmetry parameter is found to be consistent with zero. The first and the second uncertainties above are statistical and systematic, respectively, while the third ones arise due to the uncertainty of the branching fraction.
Kim, J. B.*; 谷田 聖; Belle Collaboration*; 他182名*
Physical Review D, 99(1), p.011104_1 - 011104_7, 2019/01
被引用回数:4 パーセンタイル:25.26(Astronomy & Astrophysics)We search for violation in the singly-Cabibbo-suppressed decay using data corresponding to an integrated luminosity of 988 fb collected by the Belle detector at the KEKB collider. We measure a set of five kinematically dependent asymmetries, of which four asymmetries are measured for the first time. The set of asymmetry measurements can be sensitive to violation via interference between the different partial-wave contributions to the decay and performed on other pseudoscalar decays. We find no evidence of violation.
廣瀬 茂輝*; 谷田 聖; Belle Collaboration*; 他182名*
Physical Review D, 97(1), p.012004_1 - 012004_17, 2018/01
被引用回数:129 パーセンタイル:98.93(Astronomy & Astrophysics)With the full data sample of pairs recorded by the Belle detector at the KEKB electron-positron collider, the decay is studied with the hadronic decays and . The polarization in two-body hadronic decays is measured, as well as the ratio of the branching fractions , where denotes an electron or a muon. Our results, and , are consistent with the theoretical predictions of the Standard Model. The polarization values of are excluded at the 90% confidence level.