000002534 001__ 2534
000002534 005__ 20210706052138.0
000002534 037__ $$aBELLE2-CONF-PH-2021-003
000002534 041__ $$aeng
000002534 100__ $$aFrancis Pham
000002534 245__ $$aMeasurement of the branching fraction for $B^{0} \to \pi^{0} \pi^{0}$ decays reconstructed in 2019–2020 Belle II data
000002534 260__ $$a$$c2021-07-06
000002534 300__ $$amult. p
000002534 500__ $$a23 pages, 10 figures. Supporting material for Winter 2021 conferences
000002534 520__ $$aWe report the first reconstruction of the $B^{0} \to \pi^{0} \pi^{0}$ decay mode at Belle II using samples of 2019 and 2020 data that correspond to 62.8 \invfb of integrated luminosity. We find $14.0^{+6.8}_{-5.6}$ signal decays, corresponding to a significance of 3.4 standard deviations and determine a branching ratio of $\mathcal{B}(\Bpipi) = [0.98^{+0.48}_{-0.39} \pm 0.27] \times 10^{-6}$. The results agree with previous determinations and contribute important information to an early assessment of detector performance and Belle II's potential for future determinations of $\alpha/\phi_2$ using $\PB \to \pi \pi$ modes.
000002534 6531_ $$acharmless
000002534 6531_ $$api0
000002534 700__ $$aMartin Sevior
000002534 8560_ $$ffpham@student.unimelb.edu.au
000002534 8564_ $$uhttps://docs.belle2.org/record/2534/files/B02pi0pi0_FrancisPham_arxiv.pdf