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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2006, vol. 640, p. 138-144

Search for neutrinoless decays τ → ℓ h h and τ → ℓ V0

Yusa Y., Abe K., Abe K., Adachi I., Aihara H., Asano Y., Aulchenko V., Bay A., Bitenc U., Bizjak I., Blyth S., Bondar A., Browder T. E., Chen A., Cheon B. G., Chistov R., Choi Y., Choi Y. K., Chuvikov A., Cole S., Dalseno J., Dash M., Drutskoy A., Eidelman S., Fratina S., Gabyshev N., Gershon T., Gokhroo G., Gorišek A., Ha H. C., Haba J., Hayasaka K., Hayashii H., Hazumi M., Hoshi Y., Hou W. S., Iijima T., Ikado K., Inami K., Itoh R., Iwasaki M., Iwasaki Y., Kang J. H., Kawai H., Kawasaki T., Khan H. R., Kichimi H., Kim S. K., Korpar S., Križan P., Kulasiri R., Kuo C. C., Kuzmin A., Kwon Y. J., Lesiak T., Lin S. W., Liventsev D., Majumder G., Matsumoto T., Mitaroff W., Miyazaki Y., Mizuk R., Nagamine T., Nakano E., Natkaniec Z., Nishida S., Ogawa S., Ohshima T., Okabe T., Olsen S. L., Onuki Y., Ozaki H., Pakhlov P., Palka H., Pestotnik R., Piilonen L. E., Sakai Y., Sato N., Schietinger T., Schneider O., Schwanda C., Seidl R., Senyo K., Shapkin M., Shibuya H., Shwartz B., Sokolov A., Somov A., Soni N., Stamen R., Stanič S., Starič M., Sumisawa K., Tajima O., Takasaki F., Tamai K., Tanaka M., Taylor G. N.

We have searched for neutrinoless τ lepton decays into ℓhh or ℓ V0, where ℓ stands for an electron or muon, h for a charged light hadron, π or K, and V0 for a neutral vector meson, ρ0, K* (892)0 and φ{symbol}, using a 158 fb-1 data sample collected with the Belle detector at the KEKB e+ e- collider. Since the number of events observed are consistent with the expected background, we set upper limits on the branching fractions in the range of (1.6 - 8.0) × 10-7 for various decay modes at the 90% confidence level. © 2006 Elsevier B.V. All rights reserved.