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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2008, vol. 78, p. -

Search for B→πℓ+ℓ- decays at Belle

Wei J. T., Chen K. F., Adachi I., Aihara H., Arinstein K., Aulchenko V., Aushev T., Bakich A. M., Balagura V., Belous K., Bitenc U., Bondar A., Bozek A., Bračko M., Browder T. E., Chang P., Chao Y., Chen A., Chen W. T., Cheon B. G., Chistov R., Cho I. S., Choi Y., Dalseno J., Eidelman S., Golob B., Hayashii H., Heffernan D., Hoshi Y., Hou W. S., Hyun H. J., Iijima T., Inami K., Ishino H., Itoh R., Iwasaki M., Iwasaki Y., Kah D. H., Kang J. H., Kapusta P., Kawasaki T., Kichimi H., Kim H. O., Kim J. H., Kim S. K., Kim Y. I., Kim Y. J., Kinoshita K., Korpar S., Krokovny P., Kumar R., Kwon Y. J., Kyeong S. H., Lee J. S., Lesiak T., Limosani A., Lin S. W., Liventsev D., Mandl F., Matyja A., McOnie S., Medvedeva T., Miyata H., Miyazaki Y., Moloney G. R., Nakao M., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okuno S., Ozaki H., Pakhlov P., Pakhlova G., Park C. W., Park H. K., Pestotnik R., Peters M., Piilonen L. E., Sahoo H., Sakai Y., Schneider O., Schwanda C., Senyo K., Shapkin M., Shiu J. G., Singh J. B., Somov A., Stanič S., Starič M., Sumisawa K., Sumiyoshi T., Takasaki F., Tanaka M., Taylor G. N., Teramoto Y.

We present a search for the decays B+→π+ℓ+ℓ- and B0→π0ℓ+ℓ-, where ℓ+ℓ- is either a μ+μ- or e+e- pair, with a data sample of 657×106 BB̄ pairs collected with the Belle detector at the KEKB e+e- collider. Signal events are reconstructed from a charged or a neutral pion candidate and a pair of oppositely charged electrons or muons. No significant signal is observed and we set an upper limit on the isospin-averaged branching fraction B(B→πℓ+ℓ-)<6.2×10-8 at the 90% confidence level. © 2008 The American Physical Society.