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Search for CP violation in the D+ →π+π0 decay at Belle

Babu V., Trabelsi K., Mohanty G. B., Aziz T., Greenwald D., Adachi I., Aihara H., Al Said S., Asner D. M., Atmacan H., Ayad R., Badhrees I., Bahinipati S., Bakich A. M., Bansal V., Behera P., Berger M., Bhardwaj V., Biswal J., Bobrov A., Bozek A., Bračko M., Browder T. E., Červenkov D., Chen A., Cheon B. G., Chilikin K., Cho K., Choi Y., Choudhury S., Cinabro D., Dash N., Di Carlo S., DoleŽal Z., Drásal Z., Dutta D., Eidelman S., Epifanov D., Fast J. E., Ferber T., Fulsom B. G., Gaur V., Gabyshev N., Garmash A., Gelb M., Goldenzweig P., Golob B., Guan Y., Guido E., Haba J., Hayasaka K., Hayashii H., Hedges M. T., Horiguchi T., Hou W. S., Inami K., Ishikawa A., Itoh R., Iwasaki M., Jacobs W. W., Jeon H. B., Jia S., Jin Y., Joffe D., Joo K. K., Julius T., Kaliyar A. B., Kang J. H., Kang K. H., Karyan G., Katrenko P., Kawasaki T., Kiesling C., Kim D. Y., Kim H. J., Kim J. B., Kim K. T., Kim S. H., Kim Y. J., Kinoshita K., Kodyš P., Korpar S., Kotchetkov D., KriŽan P., Kroeger R., Krokovny P., Kuhr T., Kulasiri R., Kumar R., Kuzmin A., Kwon Y. J., Lange J. S., Li L. K., Li Gioi L., Libby J., Liventsev D., Lubej M., Luo T., Masuda M., Matsuda T.

© 2018 authors. Published by the American Physical Society. We search for CP violation in the charged charm meson decay D+→π+π0, based on a data sample corresponding to an integrated luminosity of 921 fb-1 collected by the Belle experiment at the KEKB e+e- asymmetric-energy collider. The measured CP-violating asymmetry is [+2.31±1.24(stat)±0.23(syst)]%, which is consistent with the standard model prediction and has a significantly improved precision compared to previous results.