Measurement of the branching fraction for B0π0π0 decays reconstructed in 2019–2020 Belle II data

Sumitted to PubDB: 2021-07-06

Category: Conference papers and plots, Visibility: Public

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Authors Francis Pham, Martin Sevior
Date July 6, 2021
Belle II Number BELLE2-CONF-PH-2021-003
Abstract We report the first reconstruction of the B0π0π0 decay mode at Belle II using samples of 2019 and 2020 data that correspond to 62.8 \invfb of integrated luminosity. We find 14.05.6+6.8 signal decays, corresponding to a significance of 3.4 standard deviations and determine a branching ratio of B(\Bpipi)=[0.980.39+0.48±0.27]×106. 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 α/ϕ2 using \PBππ modes.

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