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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2016, vol. 94, 1, p. -

Search for a massive invisible particle X0 in B+ →e+X0 and B+ →μ+X0 decays

Park C. S., Kwon Y. J., Adachi I., Aihara H., Asner D. M., Aushev T., Babu V., Badhrees I., Bakich A. M., Barberio E., Behera P., Bhardwaj V., Biswal J., Bonvicini G., Bozek A., Bračko M., Browder T. E., Červenkov D., Chekelian V., Chen A., Cheon B. G., Chilikin K., Chistov R., Cho K., Chobanova V., Choi Y., Cinabro D., Dalseno J., Danilov M., Dash N., DoleŽal Z., Dutta D., Eidelman S., Farhat H., Fast J. E., Ferber T., Fulsom B. G., Gaur V., Gabyshev N., Garmash A., Gillard R., Goh Y. M., Goldenzweig P., Grzymkowska O., Hara T., Hayasaka K., Hayashii H., Heck M., Hou W. S., Iijima T., Inami K., Inguglia G., Ishikawa A., Itoh R., Iwasaki Y., Jaegle I., Jeon H. B., Julius T., Kang K. H., Kato E., Katrenko P., Kim D. Y., Kim J. B., Kim K. T., Kim M. J., Kim S. H., Kinoshita K., Kodyš P., Korpar S., KriŽan P., Krokovny P., Kuzmin A., Lee I. S., Li C. H., Li L., Li Y., Li Gioi L., Libby J., Liventsev D., Lubej M., Lukin P., Masuda M., Matvienko D.

© 2016 American Physical Society.We present a search for a non-Standard-Model invisible particle X0 in the mass range 0.1-1.8 GeV/c2 in B+→e+X0 and B+→μ+X0 decays. The results are obtained from a 711 fb-1 data sample that corresponds to 772×106BB pairs, collected at the Ψ(4S) resonance with the Belle detector at the KEKB e+e- collider. One B meson is fully reconstructed in a hadronic mode to determine the momentum of the lepton of the signal decay in the rest frame of the recoiling partner B meson. We find no evidence of a signal and set upper limits on the order of 10-6.