| Abstract: | This paper reports a study of $B o K^{*}gamma$ decays using $62.8pm 0.6$
fb$^{-1}$ of data collected during 2019--2020 by the Belle II experiment at the
SuperKEKB $e^{+}e^{-}$ asymmetric-energy collider, corresponding to $(68.2 pm
0.8) imes 10^6$ $Boverline{B}$ events. We find $454 pm 28$, $50 pm 10$,
$169 pm 18$, and $160 pm 17$ signal events in the decay modes $B^{0} o
K^{*0}[K^{+}pi^{-}]gamma$, $B^{0} o K^{*0}[K^0_{
m S}pi^{0}]gamma$,
$B^{+} o K^{*+}[K^{+}pi^{0}]gamma$, and $B^{+} o
K^{*+}[K^{+}pi^{0}]gamma$, respectively. The uncertainties quoted for the
signal yield are statistical only. We report the branching fractions of these
decays: $$mathcal{B} [B^{0} o K^{*0}[K^{+}pi^{-}]gamma] = (4.5 pm 0.3 pm
0.2) imes 10^{-5}, $$ $$mathcal{B} [B^{0} o K^{*0}[K^0_{
m
S}pi^{0}]gamma] = (4.4 pm 0.9 pm 0.6) imes 10^{-5},$$ $$mathcal{B}
[B^{+} o K^{*+}[K^{+}pi^{0}]gamma] = (5.0 pm 0.5 pm 0.4) imes
10^{-5}, ext{ and}$$ $$mathcal{B} [B^{+} o K^{*+}[K^0_{
m
S}pi^{+}]gamma] = (5.4 pm 0.6 pm 0.4) imes 10^{-5},$$ where the first
uncertainty is statistical, and the second is systematic. The results are
consistent with world-average values. |
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