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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2014, vol. 112, 21, p. -

Search for CP Violation in D<sup>0</sup> → π<sup>0</sup> π<sup>0</sup> Decays

Nisar N. K., Trabelsi K., Mohanty G. B., Aziz T., Abdesselam A., Adachi I., Aihara H., Arinstein K., Asner D. M., Aulchenko V., Aushev T., Ayad R., Bahinipati S., Bakich A. M., Bala A., Bansal V., Behera P., Belous K., Bhardwaj V., Bobrov A., Bonvicini G., Bozek A., Braèko M., Browder T. E., Éervenkov D., Cheon B. G., Chilikin K., Cho K., Chobanova V., Choi Y., Cinabro D., Dalseno J., Danilov M., Doležal Z., Drásal Z., Drutskoy A., Dutta D., Dutta K., Eidelman S., Epifanov D., Farhat H., Fast J. E., Ferber T., Gaur V., Gabyshev N., Ganguly S., Garmash A., Goh Y. M., Golob B., Hara T., Hayashii H., He X. H., Hoshi Y., Hou W. S., Iijima T., Ishikawa A., Itoh R., Iwasaki Y., Iwashita T., Kang J. H., Kawasaki T., Kiesling C., Kim D. Y., Kim J. B., Kim J. H., Kim M. J., Kim Y. J., Kinoshita K., Ko B. R., Kodyš P., Korpar S., Križan P., Krokovny P., Kuhr T., Kumar R., Kuzmin A., Kwon Y. J., Lange J. S., Lee S. H., Li Gioi L., Libby J., Liventsev D., Lukin P., Macek B., Matvienko D., Miyabayashi K., Miyata H., Mizuk R., Moll A., Mussa R.

© 2014 American Physical Society.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 D¯0 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 → K0Sπ0 decay: ACP (D0 → K0Sπ0) [-0.21 ± 0.16(stat) ± 0.07(syst)]%.