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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2016, vol. 93, 5, p. -

Search for the rare decay D0 →γγ at Belle

Nisar N. K., Mohanty G. B., Trabelsi K., Aziz T., Abdesselam A., Adachi I., Aihara H., Asner D. M., Aulchenko V., Aushev T., Ayad R., Babu V., Badhrees I., Bahinipati S., Barberio E., Behera P., Bhardwaj V., Biswal J., Bobrov A., Bozek A., Bračko M., Breibeck F., Browder T. E., Červenkov D., Chekelian V., Chen A., Cheon B. G., Chistov R., Cho K., Chobanova V., Choi Y., Cinabro D., Dalseno J., Dash N., DoleŽal Z., Drásal Z., Drutskoy A., Dutta D., Eidelman S., Farhat H., Fast J. E., Fulsom B. G., Gaur V., Garmash A., Gillard R., Goh Y. M., Goldenzweig P., Golob B., Greenwald D., Grzymkowska O., Haba J., Hara T., Hayasaka K., Hayashii H., He X. H., Hou W. S., Inami K., Ishikawa A., Iwasaki Y., Jacobs W. W., Jaegle I., Jeon H. B., Joffe D., Joo K. K., Julius T., Kang K. H., Kato E., Kawasaki T., Kiesling C., Kim D. Y., Kim H. J., Kim K. T., Kim M. J., Kim S. H., Kinoshita K., Kodyš P., Korpar S., KriŽan P., Krokovny P., Kuhr T., Kumar R., Kumita T.

© 2016 American Physical Society.We search for the rare radiative decay D0→γγ using a data sample with an integrated luminosity of 832 fb-1 recorded by the Belle detector at the KEKB e+e- asymmetric-energy collider. We find no statistically significant signal and set an upper limit on the branching fraction of B(D0→γγ)<8.5×10-7 at 90% confidence level. This is the most restrictive limit on the decay channel to date.