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  1. Free, publicly-accessible full text available April 1, 2027
  2. We report the first observation of the radiative decay Ds0* (2317)+→ Ds*+ γ with a statistical significance exceeding 10 standard deviations. The signal is observed in the continuum e+e−→cc¯ process, using combined data samples of 980.4  fb−1 from Belle and 427.9  fb−1 from Belle II, collected at the KEKB and SuperKEKB asymmetric-energy e+e− colliders, respectively. The branching fraction ratio B[ Ds0* (2317)+→ Ds*+ γ]/B[ Ds0* (2317)+→ Ds+ π0] is measured to be [7.13±0.70(stat)±0.26(syst)]% . This result provides crucial discrimination between theoretical models of the Ds0* (2317)+ structure. 
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    Free, publicly-accessible full text available June 1, 2027