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Oskin, P.*; 谷田 聖; Belle Collaboration*; 他198名*
Physical Review D, 102(9), p.092011_1 - 092011_8, 2020/11
被引用回数:0 パーセンタイル:0.01(Astronomy & Astrophysics)Using data collected in the Belle experiment at the KEKB asymmetric-energy collider we search for transitions , and . No significant signals are observed and we set 90% confidence level upper limits on the corresponding visible cross sections: and , respectively.
Jin, Y.*; 谷田 聖; Belle Collaboration*; 他198名*
Physical Review D, 100(7), p.071101_1 - 071101_9, 2019/10
被引用回数:3 パーセンタイル:20.12(Astronomy & Astrophysics)We present the first measurements of branching fractions of rare tau-lepton decays, ( or ), using a data sample corresponding to 562 fb collected at a center-of-mass energy of 10.58 GeV with the Belle detector at the KEKB asymmetric-energy collider. The decay is observed for the first time with 7.0 significance. The partial branching fraction determined by the structure-dependent mechanisms mediated by either a vector or an axial-vector current for the mass region GeV/ is measured to be , where the first uncertainty is statistical, the second is systematic, and the third is due to the model dependence. In the full phase space, due to the different detection efficiencies for the structure-dependent mechanisms mediated by axial-vector and vector currents, the branching fraction varies from to , respectively. An upper limit is set on the branching fraction of the decay, , at the 90% confidence level.
Dash, N.*; 谷田 聖; Belle Collaboration*; 他198名*
Physical Review Letters, 119(17), p.171801_1 - 171801_7, 2017/10
被引用回数:36 パーセンタイル:86.73(Physics, Multidisciplinary)We report a study of the decay using 921 fb of data collected at or near the and resonances with the Belle detector at the KEKB asymmetric energy collider. The measured time-integrated asymmetry is , and the branching fraction is , where the first uncertainty is statistical, the second is systematic, and the third is due to the normalization mode (). These results are significantly more precise than previous measurements available for this mode. The measurement is consistent with the standard model expectation.
Irmler, C.*; 谷田 聖; 他98名*
Journal of Instrumentation (Internet), 11(1), p.C01087_1 - C01087_9, 2016/01
被引用回数:6 パーセンタイル:31.03(Instruments & Instrumentation)The Belle II Silicon Vertex Detector comprises four layers of double-sided silicon strip detectors (DSSDs), consisting of ladders with two to five sensors each. All sensors are individually read out by APV25 chips with the Origami chip-on-sensor concept for the central DSSDs of the ladders. The chips sit on flexible circuits that are glued on the top of the sensors. This concept allows a low material budget and an efficient cooling of the chips by a single pipe per ladder. We present the construction of the first SVD ladders and results from precision measurements and electrical tests.