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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2005, vol. 622, p. 218-228

Search for lepton flavor violating decays τ- → ℓ- π0, ℓ- η, ℓ- η′

Enari Y., Sato N., Abe K., Abe K., Aihara H., Asano Y., Aulchenko V., Bahinipati S., Baakich A. M., Bedny I., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Brodzicka J., Chang M. C., Chao Y., Chen A., Chen W. T., Cheon B. G., Chistov R., Choi Y., Chuvikov A., Dalseno J., Dash M., Drutskoy A., Eidelman S., Epifanov D., Fang F., Fratina S., Gabyshev N., Gershon T., Gokhroo G., Golob B., Gorišek A., Haba J., Hayasaka K., Hayashii H., Hazumi M., Hinz L., Hokuue T., Hoshi Y., Hou S., Hou W. S., Iijima T., Imoto A., Inami K., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Kang J. H., Kang J. S., Kapusta P., Katayama N., Kawai H., Kawasaki T., Khan H. R., Kichimi H., Kim H. J., Kim S. M., Korpar S., Krokovny P., Kumar S., Kuo C. C., Kuzmin A., Kwon Y. J., Leder G., Lee S. E., Lesiak T., Li J., Lin S. W., Liventsev D., Mandl F., Matsumoto T., Mikami Y., Mitaroff W., Miyake H., Miyata H., Mizuk R., Moloney G. R., Nagamine T., Nagasaka Y., Nakano E., Nakao M., Nakazawa H., Natkaniec Z., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okabe T., Okuno S., Olsen S. L.

We have searched for lepton flavor violating semileptonic τ- decays using a data sample of 153.8 fb-1 accumulated with the Belle detector at the KEKB e+e- collider. For the six decay modes studied, the observed yield is compatible with the estimated background and the following upper limits are set at the 90% confidence level: B(τ-→e-η)<2.3×10-7, B(τ-→μ-η)<1.5×10-7, B(τ-→e-π0)<1.9×10-7, B(τ-→μ-π0)<4.1×10-7, B(τ-→e-η′) <10×10-7, and B(τ-→μ-η′)<4.7×10-7. These results are 10 to 64 times more restrictive than previous limits. © 2005 Elsevier B.V. All rights reserved.