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Measurements of the branching fractions for $B \to K^{*}γ$ decays at Belle II

Publication ,  Journal Article
Abudinén, F; Adachi, I; Adak, R; Adamczyk, K; Aggarwal, L; Ahlburg, P; Ahmed, H; Ahn, JK; Aihara, H; Akopov, N; Aloisio, A; Ameli, F; Ky, NA ...
October 15, 2021

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

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Publication Date

October 15, 2021
 

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Abudinén, F., Adachi, I., Adak, R., Adamczyk, K., Aggarwal, L., Ahlburg, P., … Uchida, M. (2021). Measurements of the branching fractions for $B \to K^{*}γ$ decays at Belle II.
Abudinén, F., I. Adachi, R. Adak, K. Adamczyk, L. Aggarwal, P. Ahlburg, H. Ahmed, et al. “Measurements of the branching fractions for $B \to K^{*}γ$ decays at Belle II,” October 15, 2021.
Abudinén F, Adachi I, Adak R, Adamczyk K, Aggarwal L, Ahlburg P, et al. Measurements of the branching fractions for $B \to K^{*}γ$ decays at Belle II. 2021 Oct 15;
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Measurements of the branching fractions for $B \to K^{*}γ$ decays at Belle II. 2021 Oct 15;

Publication Date

October 15, 2021