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Measurement of time-dependent CP violation in B0 → KS0 π0π0 decays

Yusa Y., Aihara H., Al Said S., Asner D. M., Atmacan H., Aulchenko V., Aushev T., Ayad R., Babu V., Badhrees I., Bahinipati S., Bakich A. M., Bansal V., Behera P., Bhardwaj V., Bhuyan B., Biswal J., Bozek A., Bračko M., Browder T. E., Cao L., Červenkov D., Chekelian V., Chen A., Cheon B. G., Chilikin K., Choi S. K., Choi Y., Cinabro D., Cunliffe S., Dash N., Di Carlo S., Dong T. V., Drásal Z., Eidelman S., Epifanov D., Fast J. E., Fulsom B. G., Garg R., Gaur V., Garmash A., Giri A., Goldenzweig P., Golob B., Guan Y., Haba J., Hayasaka K., Hayashii H., Hirose S., Inami K., Inguglia G., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Jacobs W. W., Jia S., Jin Y., Joo K. K., Kang K. H., Kawasaki T., Kiesling C., Kim D. Y., Kim J. B., Kim K. T., Kim S. H., Kinoshita K., Kodyš P., Korpar S., Kotchetkov D., KriŽan P., Kroeger R., Kuhr T., Kumar R., Kwon Y. J., Lange J. S., Lee I. S., Lee S. C., Li L. K., Li Y. B., Li Gioi L., Libby J., Liventsev D., Lubej M., Luo T., Masuda M., Matsuda T., Merola M., Miyabayashi K., Miyata H., Mizuk R., Mohanty G. B., Moon H. K., Nakano E., Nakao M., Nanut T., Nath K. J., Natkaniec Z., Nisar N. K., Nishida S.

© 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the »https://creativecommons.org/licenses/by/4.0/» Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP 3 . We report a measurement of time-dependent CP violation in B0→KS0π0π0 decays using a data sample of 772×106 BB pairs collected by the Belle experiment running at the ?(4S) resonance at the KEKB e+e- collider. This decay proceeds mainly via a b→sdd "penguin" amplitude. The results are sin2φ1eff=0.92-0.31+0.27 (stat.) ±0.11 (syst.) and A=0.28±0.21 (stat.) ±0.04 (syst.), which are the most precise measurements of CP violation in this decay mode to date. The value for the CP-violating parameter sin2φ1eff is consistent with that obtained using decay modes proceeding via a b→ccs "tree" amplitude.