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Measurement of the branching fraction and it CP-violating asymmetry of the decay B⁰ rightarrow π⁰ π⁰ using 387 million bottom-antibottom meson pairs in Belle II data
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arxiv 2412.14260 v1 pith:U74LZ6Z2 submitted 2024-12-18 hep-ex
Measurement of the branching fraction and it CP-violating asymmetry of the decay B⁰ rightarrow π⁰ π⁰ using 387 million bottom-antibottom meson pairs in Belle II data
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We measure the branching fraction and $\it CP$-violating flavor-dependent rate asymmetry of $B^{0} \to \pi^{0} \pi^{0}$ decays reconstructed using the Belle II detector in an electron-positron collision sample containing $387 \times 10^{6}$ $B\overline{B}$ pairs. Using an optimized event selection, we find $126\pm 20$ signal decays in a fit to background-discriminating and flavor-sensitive distributions. The resulting branching fraction is $(1.25 \pm 0.23)\times 10^{-6}$ and the $\it CP$-violating asymmetry is $0.03 \pm 0.30$.
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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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