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October 1, 2026
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Measurement of the CP asymmetry in D0 -> pi+ pi- pi0 decays at Belle II

Physical Review Letters. 2026. Vol. D. No. 113. Article 052006.
Bodrov D., Pakhlova G., Aushev Т., Abumusabh М.

We measure the time- and phase-space-integrated CP asymmetry ACP in D0 -> pi+ pi- pi0 decays reconstructed in e+ e- -> c cbar events collected by the Belle II experiment from 2019 to 2022. This sample corresponds to an integrated luminosity of 428 fb^-1. We require D0 mesons to be produced in D*+ -> D0 pi+ decays to determine their flavor at production. Control samples of D0 -> K- pi+ decays are used to correct for reconstruction-induced asymmetries. The result, ACP(D0 -> pi+ pi- pi0) = (0.29 +/- 0.27 +/- 0.13)%, where the first uncertainty is statistical and the second systematic, is the most precise result to date and is consistent with CP conservation.

Research target: Physics
Language: English
Full text
DOI
Keywords: Belle II
Publication based on the results of:
Search for New physics in the experiments on e+e- colliders (2025)
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