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Measurement of the CP asymmetry in D^+ to π^+ π⁰ decays at Belle II
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arxiv 2506.07879 v2 pith:EX4CPTLH submitted 2025-06-09 hep-ex
Measurement of the CP asymmetry in D^+ to π^+ π⁰ decays at Belle II
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We measure the CP asymmetry in $D^+ \to \pi^+ \pi^0$ decays reconstructed in $e^+ e^-$ collisions at the Belle II experiment using a data set corresponding to an integrated luminosity of 428 fb$^{-1}$. A control sample of $D^+ \to \pi^+ K_{S}$ decays is used to correct for detection and production asymmetries. The result, $A_{CP}(D^+ \to \pi^+\pi^0) =(-1.8 \pm 0.9 \pm 0.1)\%$, where the first uncertainty is statistical and the second systematic, is the most precise determination to date. It agrees with the prediction of CP symmetry from the standard model, and with results of previous measurements.
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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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