Вы находитесь на старом сайте НГУ. Перейти на новый сайт

ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2007, vol. 648, p. 341-350

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

Miyazaki Y., Adachi I., Aihara H., Anipko D., Arinstein K., Aulchenko V., Aziz T., Bakich A. M., Barberio E., Bay A., Bedny I., Belous K., Bitenc U., Bizjak I., Bondar A., Bračko M., Browder T. E., Chen A., Chen W. T., Cheon B. G., Choi Y., Choi Y. K., Dalseno J., Eidelman S., Epifanov D., Fratina S., Gabyshev N., Go A., Gorišek A., Ha H., Haba J., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Hokuue T., Hoshi Y., Hou S., Hou W. S., Iijima T., Imoto A., Inami K., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Kaji H., Kapusta P., Kawai H., Kawasaki T., Kichimi H., Kim Y. J., Korpar S., Križan P., Krokovny P., Kulasiri R., Kumar R., Kuo C. C., Kuzmin A., Kwon Y. J., Lee M. J., Lesiak T., Lin S. W., Mandl F., Matsumoto T., Miyake H., Miyata H., Nagamine T., Nagasaka Y., Nakao M., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okuno S., Onuki Y., Ozaki H., Pakhlov P., Pakhlova G., Park H., Peak L. S., Pestotnik R., Piilonen L. E., Poluektov A., Sahoo H., Sakai Y., Satoyama N., Schietinger T., Schneider O., Schümann J., Schwanda C., Schwartz A. J., Senyo K., Sevior M. E., Shibuya H., Shwartz B.

We have searched for lepton-flavor-violating τ decays with a pseudoscalar meson (η, η′ and π0) using a data sample of 401 fb-1 collected with the Belle detector at the KEKB asymmetric-energy e+ e- collider. No evidence for these decays is found and we set the following upper limits on the branching fractions: B (τ- → e- η) < 9.2 × 10-8, B (τ- → μ- η) < 6.5 × 10-8, B (τ- → e- η′) < 1.6 × 10-7, B (τ- → μ- η′) < 1.3 × 10-7, B (τ- → e- π0) < 8.0 × 10-8 and B (τ- → μ- π0) < 1.2 × 10-7 at the 90% confidence level. These results improve our previously published upper limits by factors from 2.3 to 6.3. © 2007 Elsevier B.V. All rights reserved.