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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:9.61(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.
Waheed, E.*; 谷田 聖; Belle Collaboration*; 他187名*
Physical Review D, 100(5), p.052007_1 - 052007_32, 2019/09
被引用回数:44 パーセンタイル:91.47(Astronomy & Astrophysics)We present a new measurement of the CKM matrix element from
decays, reconstructed with full Belle data set (
). Two form factor parameterisations, based on work by the CLN and BGL groups, are used to extract the product
and the decay form factors, where
is the factor normalisation and
is a small electroweak correction. In the CLN parameterisation we find
,
,
,
. In the BGL parameterisation we find
, which is higher but consistent with the determination from inclusive semileptonic
decays when correcting for
. This is the most precise measurement of
and form factors that has ever been carried out, and the first direct study of the BGL form factor parameterisation in an experimental measurement.
Sibidanov, A.*; 谷田 聖; Belle Collaboration*; 他187名*
Physical Review Letters, 121(3), p.031801_1 - 031801_8, 2018/07
被引用回数:16 パーセンタイル:71.07(Physics, Multidisciplinary)We report the result of a search for the decay . The signal events are selected based on the presence of a high momentum muon and the topology of the rest of the event showing properties of a generic
-meson decay, as well as the missing energy and momentum being consistent with the hypothesis of a neutrino from the signal decay. We find a 2.4 standard deviation excess above background including systematic uncertainties, which corresponds to a branching fraction of
or a frequentist 90% confidence level interval on the
branching fraction of
. This result is obtained from a 711 fb
data sample that contains
pairs, collected near the
resonance with the Belle detector at the KEKB asymmetric-energy
collider.
Yelton, J.*; 谷田 聖; Belle Collaboration*; 他187名*
Physical Review D, 97(3), p.032001_1 - 032001_8, 2018/02
被引用回数:11 パーセンタイル:50.62(Astronomy & Astrophysics)Using a data sample of 980 of
annihilation data taken with the Belle detector operating at the KEKB asymmetric-energy
collider, we report the results of a study of the decays of the
charmed baryon into hadronic final states. We report the most precise measurements to date of the relative branching fractions of the
into
,
,
, and
, as well as the first measurements of the branching fractions of the
into
,
, and
, all with respect to the
decay. In addition, we investigate the resonant substructure of these modes. Finally, we present a limit on the branching fraction for the decay
.
加藤 悠二*; 谷田 聖; Belle Collaboration*; 他187名*
Physical Review D, 97(1), p.012005_1 - 012005_10, 2018/01
被引用回数:24 パーセンタイル:74.92(Astronomy & Astrophysics)We present the measurement of the absolute branching fractions of and
decays, using a data sample of
pairs collected at the
resonance with the Belle detector at the KEKB asymmetric-energy
collider. Here,
denotes
,
,
,
,
,
,
,
, and
. We do not observe significant signals for
nor
, and set the 90
confidence level upper limits:
and
. These represent the most stringent upper limit for
to date and the first measurement for
. The measured branching fractions for
and
are the most precise to date:
and
, where the first and second uncertainties are statistical and systematic, respectively.