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Jia, S.*; 谷田 聖; Belle Collaboration*; 他175名*
Physical Review D, 101(9), p.091101_1 - 091101_8, 2020/05
被引用回数:11 パーセンタイル:59.14(Astronomy & Astrophysics)We report the measurement of via initial-state radiation using a data sample of an integrated luminosity of 921.9 fb collected with the Belle detector at the and nearby. We find evidence for an enhancement with a 3.4 significance in the invariant mass of The measured mass and width are and , respectively. The mass, width, and quantum numbers of this enhancement are consistent with the charmonium-like state at 4626 MeV/ recently reported by Belle in The product of the cross section and the branching fraction of is measured from threshold to 5.6 GeV.
Li, Y.*; 谷田 聖; Belle Collaboration*; 他175名*
Physical Review D, 100(11), p.112010_1 - 112010_8, 2019/12
被引用回数:1 パーセンタイル:7.79(Astronomy & Astrophysics)Using the data sample of 711 fb of on-resonance data taken by the Belle detector at the KEKB asymmetric-energy electron-positron collider, we present the first measurements of branching fractions of the decays , , and . The signal yields for these decays are extracted from the recoil mass spectrum of the system recoiling against baryons in selected candidates. The branching fraction of is measured to be , where the first uncertainty is statistical and the second is systematic. The 90% credibility level upper limits on and are determined to be and , respectively.
綿貫 峻*; 谷田 聖; Belle Collaboration*; 他175名*
Physical Review D, 99(3), p.032012_1 - 032012_13, 2019/02
被引用回数:13 パーセンタイル:60.85(Astronomy & Astrophysics)We report measurements of isospin asymmetry and difference of direct asymmetries between charged and neutral decays. This analysis is based on the data sample containing pairs that was collected with the Belle detector at the KEKB energy-asymmetric collider. Using a sum-of-exclusive technique with invariant mass up to 2.8 GeV/, we obtain % and %, where the last uncertainty for is due to the uncertainty on the production ratio of to in decays. The measured value of is consistent with zero, allowing us to constrain the resolved photon contribution in the , and improve the branching fraction prediction. The result for is consistent with the prediction of the SM. We also measure the direct asymmetries for charged and neutral decays. All the measurements are the most precise to date.
Li, Y. B.*; 谷田 聖; Belle Collaboration*; 他175名*
European Physical Journal C, 78(11), p.928_1 - 928_8, 2018/11
被引用回数:17 パーセンタイル:65.68(Physics, Particles & Fields)We report evidence for the charged charmed-strange baryon with a signal significance of 3.9 with systematic errors included. The charged is found in its decay to in the substructure of decays. The measured mass and width are ~MeV/ and ~MeV, respectively, and the product branching fraction is . We also measure with greater precision than previous experiments, and present the results of a search for the charmonium-like state and its spin partner, , in the invariant mass spectrum. No clear signals of the or are observed and the 90% credibility level (C.L.) upper limits on their production rates are determined. These measurements are obtained from a sample of pairs collected at the resonance by the Belle detector at the KEKB asymmetric energy electron-positron collider.
加藤 悠司*; 谷田 聖; Belle Collaboration*; 他175名*
Physical Review D, 94(3), p.032002_1 - 032002_10, 2016/08
被引用回数:42 パーセンタイル:85.73(Astronomy & Astrophysics)We report the discovery of , observed by its decay into the final-state , and present the first observation and evidence of the decays of and into . We also perform a combined analysis of the with the and decay modes to measure the ratios of branching fractions, masses and widths with improved accuracy. We measure the ratios of branching fractions , , and , where the uncertainties are statistical and systematic. The analysis is performed using a 980 fb data sample collected with the Belle detector at the KEKB asymmetric-energy collider.