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We search for excited charmed baryons in the system using a data sample corresponding to an integrated luminosity of . The data were collected by the Belle detector at the KEKB asymmetric-energy collider. No significant signals are found in the mass spectrum, including the known and . Clear and signals are observed in the mass spectrum. We set upper limits at 90% credibility level on ratios of branching fractions of and decaying to relative to of for the and for the . We measure ratios of branching fractions of and decaying to relative to of for the and for the . Published by the American Physical Society2024more » « less
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We report the results of the first search for Standard Model and baryon-number-violating two-body decays of the neutral mesons to and using of data collected at the resonance with the Belle detector at the KEKB asymmetric-energy collider. We observe no evidence of signal from any such decays and set 95% confidence-level upper limits on the products of and branching fractions for these two-body decays with in the range between and . Published by the American Physical Society2024more » « less
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Abstract A series of data samples was collected with the Belle II detector at the SuperKEKB collider from March 2019 to June 2022. We determine the integrated luminosities of these data samples using three distinct methodologies involving Bhabha (), digamma (), and dimuon () events. The total integrated luminosity obtained with Bhabha, digamma, and dimuon events is (426.88 ± 0.03 ± 2.61) fb−1, (429.28 ± 0.03 ± 2.62) fb−1, and (423.99 ± 0.04 ± 3.83) fb−1, where the first uncertainties are statistical and the second are systematic. The resulting total integrated luminosity obtained from the combination of the three methods is (427.87 ± 2.01) fb−1.more » « lessFree, publicly-accessible full text available January 1, 2026
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