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.

Observation of the Radiative Decay Ds0*(2317)+ → Ds*+γ

Antonioli, C.;Gaz, A.;Stroili, R.;
2026

Abstract

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.
2026
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/3615572
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