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Search for $CP$ violation in the $D^{+}\to\pi^{+}\pi^{0}$ decay at Belle
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arxiv 1712.00619 v2 pith:U3WTM2TI submitted 2017-12-02 hep-ex
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abstract
We search for $CP$ violation in the charged charm meson decay $D^{+}\to\pi^{+}\pi^{0}$, based on a data sample corresponding to an integrated luminosity of $\rm 921~fb^{-1}$ collected by the Belle experiment at the KEKB $e^{+}e^{-}$ asymmetric-energy collider. The measured $CP$ violating asymmetry is $[+2.31\pm1.24({\rm stat})\pm0.23({\rm syst})]\%$, which is consistent with the standard model prediction and has a significantly improved precision compared to previous results.
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Measurement of the CP asymmetry in $D^+ \to \pi^+ \pi^0$ decays at Belle II
hep-ex 2025-06 accept novelty 5.0 of 10
The new world-best measurement of the CP asymmetry in D+ -> pi+ pi0 decays is (-1.8 +/- 0.9 +/- 0.1)%, consistent with zero and with the Standard Model.
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