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橋本 直; 谷田 聖; 他68名*
Physical Review Letters, 128(11), p.112503_1 - 112503_6, 2022/03
被引用回数:6 パーセンタイル:78.27(Physics, Multidisciplinary)We have measured the transition X-rays of kaonic He and He atoms using superconducting transition-edge-sensor microcalorimeters with an energy resolution better than 6 eV (FWHM). We determined the energies to be (stat) (syst) eV and (stat) (syst) eV, and widths to be (stat) (syst) eV and (stat) (stat) eV, for kaonic He and He, respectively. These values are nearly 10 times more precise than in previous measurements. Our results exclude the large strong-interaction shifts and widths that are suggested by a coupled-channel approach, and agree with calculations based on optical-potential models.
Katrenko, P.*; 谷田 聖; Belle Collaboration*; 他168名*
Physical Review Letters, 124(12), p.122001_1 - 122001_7, 2020/03
被引用回数:2 パーセンタイル:22.16(Physics, Multidisciplinary)We report the first observation of the radiative decay of the into a charmonium state. The statistical significance of the observed signal of is 6.3 standard deviations including systematics. The branching fraction is calculated to be Br() = . We also searched for radiative decays into and and set upper limits on their branching fractions. These results are obtained from a 24.9 fb data sample collected with the Belle detector at the KEKB asymmetric-energy collider at a center-of-mass energy equal to the mass using tagging by the transitions.
Guido, E.*; 谷田 聖; Belle Collaboration*; 他168名*
Physical Review Letters, 121(6), p.062001_1 - 062001_7, 2018/08
被引用回数:8 パーセンタイル:54.37(Physics, Multidisciplinary)We report the first observation of the hadronic transition , using 496 fb data collected at the resonance with the Belle detector at the KEKB asymmetric-energy collider. We reconstruct the meson through its decays to and to , with . We measure: , with a significance of 5.7.
Adare, A.*; 長谷川 勝一; 今井 憲一; 永宮 正治; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他468名*
Physical Review C, 98(1), p.014912_1 - 014912_16, 2018/07
被引用回数:7 パーセンタイル:53.6(Physics, Nuclear)We present measurements of two-particle angular correlations between high-transverse-momentum ( GeV/) observed at midrapidity () and particles produced either at forward () or backward () rapidity in Au and collisions at GeV. The azimuthal angle correlations for particle pairs with this large rapidity gap in the Au-going direction exhibit a ridge-like structure that persists up to GeV/ and which strongly depends on collision centrality, which is a similar characteristic to the hydrodynamical particle flow in A+A collisions. The ridge-like structure is absent in the -going direction as well as in collisions, in the transverse-momentum range studied. The results indicate that the ridge-like structure is shifted in the Au-going direction toward more central collisions, similar to the charged-particle pseudorapidity distributions.
成木 恵*; 杉村 仁志; 今井 憲一; 市川 裕大; 細見 健二; 他68名*
Few-Body Systems, 54(7-10), p.955 - 960, 2013/08
被引用回数:2 パーセンタイル:20.07(Physics, Multidisciplinary)J-PARCにおいてペンタクォーク探索実験を行った。測定方法として()方法が用いられ、これまでのSPring-8で行われた光生成反応とは違う反応である。ハドロン反応のほうがより直接的な反応のため、より有意なデータが提供できた。結果として、ペンタクォークは確認できず、生成断面積として、0.26b/srの上限値を与えた。このことにより、SPring-8との違いが考察され、生成反応の違いにより断面積も違うという結果が分かった。