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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2015, vol. 92, 1, p. -

Evidence for the decay B0 →ηπ0

Pal B., Schwartz A. J., Abdesselam A., Adachi I., Aihara H., Al Said S., Arinstein K., Asner D. M., Aulchenko V., Aushev T., Ayad R., Babu V., Badhrees I., Bakich A. M., Bobrov A., Bonvicini G., Bozek A., Bračko M., Browder T. E., Červenkov D., Chang M. C., Chekelian V., Chen A., Cheon B. G., Cho K., Chobanova V., Choi Y., Cinabro D., Dalseno J., Doležal Z., Drásal Z., Drutskoy A., Dutta D., Eidelman S., Farhat H., Fast J. E., Ferber T., Frost O., Fulsom B. G., Gaur V., Gabyshev N., Ganguly S., Garmash A., Getzkow D., Gillard R., Glattauer R., Goh Y. M., Golob B., Grzymkowska O., Hara T., Hayasaka K., Hayashii H., He X. H., Hou W. S., Huschle M., Hyun H. J., Iijima T., Ishikawa A., Itoh R., Iwasaki Y., Jaegle I., Julius T., Kang K. H., Kato E., Kiesling C., Kim D. Y., Kim J. B., Kim J. H., Kim K. T., Kim M. J., Kim S. H., Kim Y. J., Kinoshita K., Ko B. R., Kodyš P., Korpar S., Križan P., Krokovny P., Kuhr T., Kumita T., Kuzmin A., Kwon Y. J., Lange J. S., Lee D. H., Lee I. S., Li Y., Li Gioi L.

© 2015 American Physical Society. © 2015 American Physical Society. We report a search for the charmless hadronic decay B0→ηπ0 with a data sample corresponding to an integrated luminosity of 694 fb-1 containing 753×106 BB¯ pairs. The data were collected by the Belle experiment running on the Y(4S) resonance at the KEKB e+e- collider. We measure a branching fraction B(B0→ηπ0)=(4.1-1.5-0.7+1.7+0.5)×10-7, where the first uncertainty is statistical and the second is systematic. Our measurement gives an upper limit of B(B0→ηπ0)<6.5×10-7 at 90% confidence level. The signal has a significance of 3.0 standard deviations and constitutes the first evidence for this decay mode.