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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2006, vol. 639, p. 159-164

Search for lepton flavor violating τ- decays with a KS 0 meson

Miyazaki Y., Abe K., Abe K., Aihara H., Anipko D., Arinstein K., Aulchenko V., Aushev T., Bakich A. M., Barbero M., Bedny I., Belous K., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Browder T. E., Chen A., Chen W. T., Chistov R., Choi Y., Choi Y. K., Chuvikov A., Cole S., Dalseno J., Danilov M., Dash M., Dragic J., Eidelman S., Epifanov D., Gabyshev N., Gershon T., Gorišek A., Ha H., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Hokuue T., Hoshi Y., Hou S., Iijima T., Imoto A., Inami K., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Kang J. H., Kapusta P., Kawai H., Khan H. R., Kichimi H., Kim H. O., Korpar S., Krokovny P., Kumar R., Kuo C. C., Kuzmin A., Kwon Y. J., Lee J., Lesiak T., Lin S. W., Mandl F., Matsumoto T., McOnie S., Mitaroff W., Miyake H., Miyata H., Nakano E., Nakao M., Nishida S., Nitoh O., Noguchi S., Ogawa S., Ohshima T., Okabe T., Okuno S., Onuki Y., Ozaki H., Palka H., Park H., Peak L. S., Pestotnik R., Piilonen L. E., Poluektov A., Sakai Y., Schietinger T., Schneider O., Seidl R., Senyo K., Sevior M. E., Shapkin M., Shibuya H.

We have searched for the lepton flavor violating decays τ- → ℓ- KS 0 (ℓ = e or μ), using a data sample of 281 fb-1 collected with the Belle detector at the KEKB e+ e- asymmetric-energy collider. No evidence for a signal was found in either of the decay modes, and we set the following upper limits for the branching fractions: B (τ- → e- KS 0) < 5.6 × 10-8 and B (τ- → μ- KS 0) < 4.9 × 10-8 at the 90% confidence level. These results improve the previously published limits set by the CLEO Collaboration by factors of 16 and 19, respectively. © 2006 Elsevier B.V. All rights reserved.