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Evidence for the decay B0 →p p π0 EVIDENCE for the DECAY ⋯ PAL et al.

Pal B., Adachi I., Adamczyk K., Aihara H., Asner D. M., Atmacan H., Aulchenko V., Aushev T., Ayad R., Babu V., Badhrees I., Bansal V., Behera P., Beleño C., Berger M., Bhardwaj V., Bhuyan B., Bilka T., Biswal J., Bobrov A., Bozek A., Bračko M., Browder T. E., Campajola M., Cao L., Červenkov D., Chekelian V., Chen A., Cheon B. G., Chilikin K., Cho K., Choi S. K., Choi Y., Cinabro D., Cunliffe S., Di Carlo S., DoleŽal Z., Dong T. V., Dossett D., Eidelman S., Epifanov D., Fast J. E., Ferber T., Fulsom B. G., Garg R., Gaur V., Gabyshev N., Garmash A., Giri A., Goldenzweig P., Guan Y., Haba J., Hara T., Hayasaka K., Hayashii H., Hou W. S., Hsu C. L., Iijima T., Inami K., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Jacobs W. W., Jia S., Jin Y., Joffe D., Joo K. K., Kaliyar A. B., Karyan G., Kichimi H., Kiesling C., Kim C. H., Kim D. Y., Kim K. T., Kim S. H., Kinoshita K., Kodyš P., Korpar S., Kotchetkov D., KriŽan P., Kroeger R., Krokovny P., Kulasiri R., Kwon Y. J., Lee J. Y., Lee S. C., Li L. K., Li Y. B., Li Gioi L., Libby J., Liventsev D., Lu P. C., Luo T., Macnaughton J., Macqueen C., Masuda M., Matsuda T., Matvienko D., Merola M.

© 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. We report a search for the charmless baryonic decay B0→ppπ0 with a data sample corresponding to an integrated luminosity of 711 fb-1 containing (772±10)×106 BB pairs. The data were collected by the Belle experiment running on the (4S) resonance at the KEKB e+e- collider. We measure a branching fraction B(B0→ppπ0)=(5.0±1.8±0.6)×10-7, where the first uncertainty is statistical and the second is systematic. The signal has a significance of 3.1 standard deviations and constitutes the first evidence for this decay mode. We also search for the intermediate two-body decays B0→Δ+p and B0→Δ-p, and set an upper limit on the branching fraction, B(B0→Δ+p)+B(B0→Δ-p)<1.6×10-6 at 90% confidence level.