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Choudhury, S.*; 谷田 聖; Belle Collaboration*; 他198名*
Physical Review D, 107(3), p.L031102_1 - L031102_6, 2023/02
被引用回数:12 パーセンタイル:72.68(Astronomy & Astrophysics)We measure the ratio of branching fractions for the decays to
and
using
and
samples, where
stands for
(
or
), with
fb
of data collected at the
resonance with the Belle detector. We find the decay rate ratio of
over
to be
, which is the most precise measurement to date. The first and second uncertainties are statistical and systematic, respectively, and the third uncertainty is systematic due to the assumption of isospin symmetry in
.
Krohn, J.-F.*; 谷田 聖; Belle Collaboration*; 他198名*
Physical Review D, 107(1), p.012003_1 - 012003_12, 2023/01
被引用回数:3 パーセンタイル:15.61(Astronomy & Astrophysics)Using
meson pairs recorded by the Belle experiment at the KEKB
collider, we report the branching fractions
and
; the quoted uncertainties are statistical and systematic, respectively. A measurement of the ratio of these branching fractions is also presented,
, where systematic uncertainties due to the
meson reconstruction cancel out. Furthermore, we report a new QCD factorization test based on the measured ratios for
and
decays at squared momentum transfer values equivalent to the mass of the
or
hadron. The parameters
are measured to be
and
, where the last uncertainties account for all external inputs. These values are approximately
lower than those expected from theoretical predictions. Subsequently, flavor
symmetry is tested by measuring the ratios for pions and kaons,
, as well as for different particle species. The ratio is consistent with unity and therefore no evidence for
symmetry breaking effects is found at the
precision level.
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:0.00(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:4 パーセンタイル:21.83(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:38 パーセンタイル:85.32(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:28.24(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.