Kavli Affiliate: T. Higuchi
| First 5 Authors: Belle II Collaboration, Belle II Collaboration, , ,
| Summary:
We observe the radiative decay $D^*_s0(2317)^+ to D_s^*+ gamma$
for the first time, with a significance exceeding $10$ standard deviations. The
signal is found in the continuum $e^+ e^- to cbarc$ process with the
combined data samples of 980.4~$rm fb^-1$ and 427.9~$rm fb^-1$ collected
by the Belle and Belle~II detectors operating at the KEKB and SuperKEKB
asymmetric-energy $e^+e^-$ colliders, respectively. The branching fraction
ratio $cal B(D^*_s0(2317)^+ to D_s^*+ gamma)/cal
B(D^*_s0(2317)^+ to D_s^+ pi^0)$ is measured to be $[7.14 pm
0.70(rm stat.) pm 0.23(rm syst.)]%$. This result provides significant
new experimental input for the determination of the quark structure of the
$D^*_s0(2317)^+$, which remains unknown.
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