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Free, publicly-accessible full text available April 1, 2027
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We report the first observation of the radiative decay with a statistical significance exceeding 10 standard deviations. The signal is observed in the continuum process, using combined data samples of from Belle and from Belle II, collected at the KEKB and SuperKEKB asymmetric-energy colliders, respectively. The branching fraction ratio is measured to be . This result provides crucial discrimination between theoretical models of the structure.more » « lessFree, publicly-accessible full text available June 1, 2027
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