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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2003, vol. 68, p. -

Search for B0→ℓ+ℓ- at the Belle detector

Chang M. C., Chang P., Abe K., Abe T., Adachi I., Aihara H., Akatsu M., Asano Y., Aso T., Aulchenko V., Aushev T., Bakich A. M., Bedny I., Bizjak I., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chao Y., Chen K. F., Cheon B. G., Chistov R., Choi S. K., Choi Y., Choi Y. K., Chuvikov A., Dong L. Y., Eidelman S., Eiges V., Fukunaga C., Gabyshev N., Gershon T., Gokhroo G., Golob B., Hara T., Hayashii H., Hazumi M., Higuchi T., Hinz L., Hokuue T., Hoshi Y., Hou W. S., Hsiung Y. B., Huang H. C., Iijima T., Inami K., Ishikawa A., Itoh R., Iwasaki H., Iwasaki M., Iwasaki Y., Kang J. H., Kang J. S., Kapusta P., Kawai H., Kawasaki T., Kichimi H., Kim H. J., Kim J. H., Kim S. K., Kinoshita K., Koppenburg P., Korpar S., Krokovny P., Kuzmin A., Kwon Y. J., Lee S. H., Lesiak T., Li J., Limosani A., Lin S. W., MacNaughton J., Mandl F., Marlow D., Matsumoto T., Matyja A., Mitaroff W., Miyake H., Miyata H., Mohapatra D., Mori T., Nagamine T., Nagasaka Y., Nakano E., Nakao M., Nakazawa H., Natkaniec Z., Nishida S., Nitoh O., Noguchi S., Ogawa S., Ohshima T., Okabe T., Okuno S., Olsen S. L.

We report the results of a search for the decay B0→e +e-, μ+μ- and e ±μ∓ based on an analysis of 78 fb -1 of data collected by the Belle detector at KEKB. No candidate events have been found. Upper limits on the branching fractions are calculated at the 90% confidence level: B(B0→e+e -)<1.9×10-7, B(B0 →μ +μ-)<1.6×10-7, and B(B 0→e±μ∓)<1. 7×10-7. A limit on the Pati-Salam leptoquark mass M LQ46 TeV/c2 is obtained at the 90% confidence level. © 2003 The American Physical Society.