Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Kovalenko, E.*; 谷田 聖; Belle Collaboration*; 他181名*
Physical Review D, 104(11), p.112006_1 - 112006_12, 2021/12
被引用回数:0 パーセンタイル:0.01(Astronomy & Astrophysics)We report the first observation of the processes at
=10.866 GeV with a
and
significance respectively. The measured Born cross sections are
pb, and
pb. We also set the upper limit on the cross section of the process
to be
~pb at
CL. The results are obtained with the data sample collected with the Belle detector at the KEKB asymmetric-energy
collider in the energy range from 10.63 GeV to 11.02 GeV.
van Tonder, R.*; 谷田 聖; Belle Collaboration*; 他202名*
Physical Review D, 104(11), p.112011_1 - 112011_32, 2021/12
被引用回数:5 パーセンタイル:62.22(Astronomy & Astrophysics)We present the measurement of the first to fourth order moments of the four-momentum transfer squared, , of inclusive
decays using the full Belle data set of 711
of integrated luminosity at the
resonance where
. The determination of these moments and their systematic uncertainties open new pathways to determine the absolute value of the CKM matrix element
using a reduced set of matrix elements of the heavy quark expansion. In order to identify and reconstruct the
system, we reconstruct one of the two
-mesons using machine learning techniques in fully hadronic decay modes. The moments are measured with progressively increasing threshold selections on
starting with a lower value of 3.0
in steps of 0.5
up to a value of 10.0
. The measured moments are further unfolded, correcting for reconstruction and selection effects as well as QED final state radiation. We report the moments separately for electron and muon final states and observe no lepton flavor universality violating effects.
Cao, L.*; 谷田 聖; Belle Collaboration*; 他199名*
Physical Review Letters, 127(26), p.261801_1 - 261801_8, 2021/12
被引用回数:1 パーセンタイル:34.04(Physics, Multidisciplinary)The first measurements of differential branching fractions of inclusive semileptonic decays are performed using the full Belle data set of 711 fb
of integrated luminosity at the
resonance and for
. Differential branching fractions are reported as a function of the lepton momentum, the four-momentum-transfer squared, light-cone momenta, the hadronic mass, and the hadronic mass squared. They are obtained by subtracting the backgrounds from semileptonic
decays and other processes, and corrected for resolution and acceptance effects. The measured distributions are compared to predictions from inclusive and hybrid
calculations.
Atmacan, H.*; 谷田 聖; Belle Collaboration*; 他219名*
Physical Review D, 104(9), p.L091105_1 - L091105_9, 2021/11
被引用回数:2 パーセンタイル:23.79(Astronomy & Astrophysics)We present a search for the lepton-flavor-violating decays , where
, using the full data sample of
pairs recorded by the Belle detector at the KEKB asymmetric-energy
collider. We use events in which one
meson is fully reconstructed in a hadronic decay mode. The
lepton is reconstructed indirectly using the momentum of the reconstructed
and that of the
from the signal decay. We find no evidence for
decays and set upper limits on their branching fractions at 90% confidence level of
(
)
and
(
)
.
Abudinn, F.*; 谷田 聖; Belle II Collaboration*; 他385名*
Physical Review Letters, 127(21), p.211801_1 - 211801_9, 2021/11
被引用回数:3 パーセンタイル:45.29(Physics, Multidisciplinary)We report a measurement of the and
lifetimes using
and
decays reconstructed in
data recorded by the Belle II experiment at the SuperKEKB asymmetric-energy
collider. The data, collected at center-of-mass energies at or near the
resonance, correspond to an integrated luminosity of
. The results,
and
, are the most precise to date and are consistent with previous determinations.
宇野 健太*; 谷田 聖; Belle Collaboration*; 他181名*
Journal of High Energy Physics (Internet), 2021(10), p.19_1 - 19_12, 2021/10
被引用回数:7 パーセンタイル:62.22(Physics, Particles & Fields)Charged lepton flavor violation is forbidden in the Standard Model but possible in several new physics scenarios. In many of these models, the radiative decays (
) are predicted to have a sizeable probability, making them particularly interesting channels to search at various experiments. An updated search via
using full data of the Belle experiment, corresponding to an integrated luminosity of 988 fb
, is reported for charged lepton flavor violation. No significant excess over background predictions from the Standard Model is observed, and the upper limits on the branching fractions,
and
, are set at 90% confidence level.
Li, S. X.*; 谷田 聖; Belle Collaboration*; 他193名*
Physical Review D, 104(7), p.072008_1 - 072008_8, 2021/10
被引用回数:3 パーセンタイル:33.83(Astronomy & Astrophysics)Using 980.6 of data collected with the Belle detector operating at the KEKB asymmetric-energy
collider, we present a measurement of the branching fraction of the singly Cabibbo-suppressed decay
. A clear
signal is observed for
with a statistical significance of 9.1 standard deviations, and we measure the ratio of branching fractions
, from which we infer the branching fraction
. The first quoted uncertainty is statistical, the second systematic, and the third from the reference mode
.
Li, L. K.*; 谷田 聖; Belle Collaboration*; 他187名*
Journal of High Energy Physics (Internet), 2021(9), p.75_1 - 75_21, 2021/09
被引用回数:1 パーセンタイル:12.34(Physics, Particles & Fields)We measure the branching fractions and asymmetries for the singly Cabibbo-suppressed decays
,
, and
, using 980 fb
of data from the Belle experiment at the KEKB
collider. We obtain
where the third uncertainty (
) is from the uncertainty in the branching fraction of the reference mode
. The color-suppressed decay
is observed for the first time, with very high significance. The results for the
asymmetries are
The results for
are a significant improvement over previous results. The branching fraction and
results for
, and the
result for
, are the first such measurements. No evidence for
violation is found in any of these decays.
Li, Y.*; 谷田 聖; Belle Collaboration*; 他190名*
Physical Review D, 104(5), p.052005_1 - 052005_9, 2021/09
被引用回数:7 パーセンタイル:62.22(Astronomy & Astrophysics)Using a data sample of 980~fb collected with the Belle detector operating at the KEKB asymmetric-energy
collider, we present evidence for the
in the resonant substructure of
(
=
+
) decays. The significance of the
signal is 4.2
after considering the systematic uncertainties. The ratio of the branching fraction of
relative to that of
is calculated to be 0.220
0.059(stat.)
0.035(syst.). The individual ratios of the branching fractions of the two isospin modes are also determined, and found to be
=(9.6
3.2(stat.)
1.8(syst.))% and
= (5.5
2.8(stat.)
0.7(syst.))%.
Yelton, J.*; 谷田 聖; Belle Collaboration*; 他205名*
Physical Review D, 104(5), p.052003_1 - 052003_8, 2021/09
被引用回数:3 パーセンタイル:33.83(Astronomy & Astrophysics)Using 980 of data
with the Belle detector operating at the KEKB asymmetric-energy
collider, we report the measurements of the masses, and the first measurements of the instrinsic widths, of the
and
charmed baryons. We find
,
,
, and
, where the uncertainties are statistical and systematic, respectively. These measurements can be used to test models of the underlying quark structure of the
states.
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:19 パーセンタイル:92(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.
Nisar, N. K.*; 谷田 聖; Belle Collaboration*; 他197名*
Physical Review D, 104(3), p.L031101_1 - L031101_8, 2021/08
被引用回数:0 パーセンタイル:12.34(Astronomy & Astrophysics)We report the results of the first search for the decay using
of data collected at the
resonance with the Belle detector at the KEKB asymmetric-energy
collider. We observe no significant signal and set a 90% confidence-level upper limit of
on the branching fraction of this decay.
Cao, L.*; 谷田 聖; Belle Collaboration*; 他236名*
Physical Review D, 104(1), p.012008_1 - 012008_32, 2021/07
被引用回数:6 パーセンタイル:66.69(Astronomy & Astrophysics)We present measurements of partial branching fractions of inclusive semileptonic decays using the full Belle data set of 711 fb
of integrated luminosity at the
resonance and for
. Inclusive semileptonic
decays are CKM suppressed and measurements are complicated by the large background from CKM-favored
transitions, which have a similar signature. Using machine learning techniques, we reduce this and other backgrounds effectively, whilst retaining access to a large fraction of the
phase space and high signal efficiency. We measure partial branching fractions in three phase-space regions covering about
to
of the accessible
phase space. The most inclusive measurement corresponds to the phase space with lepton energies of
GeV, and we obtain
from a two-dimensional fit of the hadronic mass spectrum and the four-momentum-transfer squared distribution, with the uncertainties denoting the statistical and systematic error. We find
from an average of four calculations for the partial decay rate with the third uncertainty denoting the average theory error. This value is higher but compatible with the determination from exclusive semileptonic decays within 1.3 standard deviations.
Dubey, S.*; 谷田 聖; Belle Collaboration*; 他171名*
Physical Review D, 104(1), p.012007_1 - 012007_11, 2021/07
被引用回数:1 パーセンタイル:12.34(Astronomy & Astrophysics)We report the first search for the penguin-dominated process using a semi-inclusive method. A 121.4
integrated luminosity
data set collected by the Belle experiment, at the KEKB asymmetric-energy
collider, is used. We observe no statistically significant signal and including all uncertainties, we set a 90% confidence level upper limit on the partial branching fraction at 1.4
10
for
2.4 GeV/
.
Jia, S.*; 谷田 聖; Belle Collaboration*; 他200名*
Physical Review D, 104(1), p.012012_1 - 012012_9, 2021/07
被引用回数:0 パーセンタイル:0.01(Astronomy & Astrophysics)For the first time we search for the in
at
= 10.52, 10.58, and 10.867 GeV with data samples of 89.5 fb
, 711 fb
, and 121.4 fb
, respectively, accumulated with the Belle detector at the KEKB asymmetric energy electron-positron collider. No significant
signal is observed in the mass range between 3.8 and 3.88 GeV/
. The upper limit at 90% confidence level on the product of the Born cross section for
and branching fraction for
is determined to be
4.9 fb at
near 10.6 GeV.
Jia, S.*; 谷田 聖; Belle Collaboration*; 他186名*
Journal of High Energy Physics (Internet), 2021(6), p.160_1 - 160_13, 2021/06
被引用回数:4 パーセンタイル:42.77(Physics, Particles & Fields)Using a data sample of 980 fb collected with the Belle detector at the KEKB asymmetric-energy
collider, we study the processes of
,
, and
for the first time. The relative branching ratios to the normalization mode of
are measured to be
where the uncertainties are statistical and systematic, respectively. We obtain the branching fractions of
,
, and
to be
where the uncertainties are statistical, systematic, and from
, respectively. The asymmetry parameters
and
are
and
, respectively, where the uncertainties are statistical followed by systematic.
Mizuk, R.*; 谷田 聖; Belle Collaboration*; 他188名*
Journal of High Energy Physics (Internet), 2021(6), p.137_1 - 137_35, 2021/06
被引用回数:2 パーセンタイル:23.79(Physics, Particles & Fields)We report the first measurement of the exclusive cross sections ,
, and
in the energy range from 10.63 GeV to 11.02 GeV. The
mesons are fully reconstructed in a large number of hadronic final states and the three channels are identified using a beam-constrained-mass variable. The shapes of the exclusive cross sections show oscillatory behavior with several maxima and minima. The results are obtained using data collected by the Belle experiment at the KEKB asymmetric-energy
collider.
Guan, Y.*; 谷田 聖; Belle Collaboration*; 他202名*
Physical Review D, 103(11), p.112005_1 - 112005_11, 2021/06
被引用回数:3 パーセンタイル:42.77(Astronomy & Astrophysics)We report measurements of the branching fractions and asymmetries for
,
, and
decays, and the branching fraction for
. Our results are based on a data sample corresponding to an integrated luminosity of 921 fb
collected by the Belle detector at the KEKB
asymmetric-energy collider. Our measurements of
asymmetries in these decays are the most precise to-date; no evidence for
violation is found.
McNeil, J. T.*; 谷田 聖; Belle Collaboration*; 他193名*
Physical Review D, 103(11), p.112002_1 - 112002_11, 2021/06
被引用回数:2 パーセンタイル:23.79(Astronomy & Astrophysics)Using the entire data sample of
integrated luminosity collected with the Belle detector at the KEKB asymmetric-energy
collider, we present an amplitude analysis measuring the branching fractions of the Cabibbo-allowed,
-exchange resonant decay
with a polarized
and the non-resonant decay via a direct process
. We present these measurements, relative to the normalization mode
, and find branching ratios
=
and
=
which suggest that only minor cusping peaks occur in the combinatorial background of
due to these
decays.
Moon, T. J.*; 谷田 聖; Belle Collaboration*; 他203名*
Physical Review D, 103(11), p.L111101_1 - L111101_9, 2021/06
被引用回数:12 パーセンタイル:83.12(Astronomy & Astrophysics)We report results from a study of the spin and parity of using a
data sample collected by the Belle detector at the KEKB asymmetric-energy
collider. The decay angle distributions in the chain
are analyzed to determine the spin of this charmed-strange baryon. The angular distributions strongly favor the
spin
over
or
, under an assumption that the lowest partial wave dominates in the decay. We also measure the ratio of
decay branching fractions
/
=1.67
, where the last uncertainty is due to possible isospin-symmetry-breaking effects. This
value favors the spin-parity
with the spin of the light-quark degrees of freedom
. This is the first determination of the spin and parity of a charmed-strange baryon.