arxiv: 2303.08354 · v3 · ★pith:CQPR5MX2new · submitted 2023-03-15 · ✦ hep-ex
Measurement of the branching fraction and it CP asymmetry of B⁰ rightarrow π⁰ π⁰ decays using 198 times 10⁶ Boverline{B} pairs in Belle II data
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We report measurements of the branching fraction and $\it CP$ asymmetry in $B^{0} \to \pi^{0} \pi^{0}$ decays reconstructed at Belle II in an electron-positron collision sample containing $198 \times 10^{6}$ $B\overline{B}$ pairs. We measure a branching fraction $\mathcal{B}(\Bpipi) = (1.38 \pm 0.27 \pm 0.22) \times 10^{-6}$ and a $\it CP$ asymmetry $\Acp(\Bpipi) = 0.14 \pm 0.46 \pm 0.07$, where the first uncertainty is statistical and the second is systematic.
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CP asymmetries in charged meson decay to two pions
hep-ph 2026-05 unverdicted novelty 4.0
CP asymmetries for B+ to pi+ pi0, D+ to pi+ pi0, and K+ to pi+ pi0 are estimated in the Standard Model at roughly 3 times 10 to the -3, 10 to the -5, and 10 to the -6 using a unified formalism for isospin violation.
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