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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2004, vol. 589, p. 103-110

Search for neutrinoless decays τ→3ℓ

Yusa Y., Nagamine T., Yamaguchi A., Abe K., Abe K., Abe T., Adachi I., Aihara H., Akatsu M., Asano Y., Aulchenko V., Aushev T., Bahinipati S., Bakich A. M., Banas E., Bedny I., Bitenc U., Bizjak I., Bondar A., Bozek A., Bračko M., Browder T. E., Chang M. C., Cheon B. G., Chistov R., Choi Y., Chuvikov A., Danilov M., Dong L. Y., Eidelman S., Eiges V., Enari Y., Fratina S., Gabyshev N., Garmash A., Gershon T., Gokhroo G., Golob B., Haba J., Hayashii H., Hazumi M., Hinz L., Hokuue T., Hoshi Y., Hou W. S., Iijima T., Inami K., Ishikawa A., Itoh R., Iwasaki H., Iwasaki M., Kang J. H., Kang J. S., Kapusta P., Katayama N., Kawai H., Kawasaki T., Kichimi H., Kim H. O., Koppenburg P., Korpar S., Križan P., Krokovny P., Kuzmin A., Kwon Y. J., Lee S. H., Lesiak T., Li J., Lin S. W., MacNaughton J., Matsumoto T., Matyja A., Mikami Y., Mitaroff W., Miyata H., Mohapatra D., Moloney G. R., Mori T., Nagasaka Y., Nakano E., Nakao M., Nakazawa H., Natkaniec Z., Nishida S., Nitoh O., Nozaki T., Ogawa S., Ohshima T., Okabe T., Okuno S., Olsen S. L., Ostrowicz W., Ozaki H., Pakhlov P., Palka H., Park H.

We have searched for neutrinoless τ lepton decays into three charged leptons using an 87.1fb-1 data sample collected with the Belle detector at the KEKB e+e- collider. Since the number of signal candidate events is compatible with that expected from the background, we set 90% confidence level upper limits on the branching fractions in the range (1.9-3.5)×10-7 for various decay modes τ -→ℓ-ℓ+ℓ- where ℓ represents e or μ. © 2004 Published by Elsevier B.V.