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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:10.54(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:43 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:71.75(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:10 パーセンタイル:48.48(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:75.86(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.