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Measurement of the branching fraction for B0→π0π0 decays reconstructed in 2019-2020 Belle II data

MPS-Authors

Andricek,  L.
Max Planck Semiconductor Laboratory, Max Planck Society;

Ninkovic,  J.
Max Planck Semiconductor Laboratory, Max Planck Society;

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2107.02373.zip
(Preprint), 465KB

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Citation

Belle II Collaboration, Abudinén, F., Adachi, I., Adak, R., Adamczyk, K., Ahlburg, P., et al. (in preparation). Measurement of the branching fraction for B0→π0π0 decays reconstructed in 2019-2020 Belle II data.


Cite as: https://hdl.handle.net/21.11116/0000-0010-08FE-8
Abstract
We report the first reconstruction of the $B^{0} \to \pi^{0} \pi^{0}$ decay
mode at Belle II using samples of 2019 and 2020 data that correspond to 62.8
fb$^{-1}$ of integrated luminosity. We find $14.0^{+6.8}_{-5.6}$ signal decays,
corresponding to a significance of 3.4 standard deviations and determine a
branching ratio of $\mathcal{B}(B^{0} \rightarrow \pi^{0} \pi^{0}) =
[0.98^{+0.48}_{-0.39} \pm 0.27] \times 10^{-6}$. The results agree with
previous determinations and contribute important information to an early
assessment of detector performance and Belle II's potential for future
determinations of $\alpha/\phi_2$ using $B \rightarrow \pi \pi$ modes.