ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2014, vol. 112, p. -
Search for CP violation in D0 → π0π0 decays
We search for CP violation in neutral charm meson decays using a data sample with an integrated luminosity of 966 fb-1 collected with the Belle detector at the KEKB e+e- asymmetric-energy collider. The asymmetry obtained in the rate of D0 and D̄0 decays to the π0π0 final state, [-0.03±0.64(stat)±0.10(syst)]%, is consistent with no CP violation. This constitutes an order of magnitude improvement over the existing result. We also present an updated measurement of the CP asymmetry in the D0→KS0π0 decay: ACP(D0→KS0π0)=[-0.21±0.16(stat)±0. 07(syst)]%. © 2014 American Physical Society.