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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2008, vol. 660, p. 154-160

Search for lepton flavor violating τ decays into three leptons

Miyazaki Y., Adachi I., Aihara H., Arinstein K., Aulchenko V., Aushev T., Bakich A. M., Balagura V., Barberio E., Bay A., Bitenc U., Bondar A., Bozek A., Bračko M., Browder T. E., Chen A., Chen K. F., Chen W. T., Cheon B. G., Chistov R., Cho I. S., Choi Y., Dash M., Drutskoy A., Eidelman S., Epifanov D., Gabyshev N., Ha H., Haba J., Hara K., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Iijima T., Inami K., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Kah D. H., Kaji H., Kapusta P., Kawai H., Kawasaki T., Kichimi H., Kim H. J., Kim Y. J., Kinoshita K., Kozakai Y., Križan P., Krokovny P., Kumar R., Kuo C. C., Kuzmin A., Kwon Y. J., Lee J. S., Lee M. J., Lee S. E., Lin S. W., Liu Y., Liventsev D., Mandl F., McOnie S., Mitaroff W., Miyake H., Miyata H., Mizuk R., Mohapatra D., Moloney G. R., Mori T., Nagamine T., Nakano E., Nakao M., Nakazawa H., Natkaniec Z., Nishida S., Nitoh O., Noguchi S., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Ozaki H., Pakhlov P., Pakhlova G., Park C. W., Park H., Park K. S., Pestotnik R., Piilonen L. E.

We search for lepton flavor violating τ decays into three leptons (electron or muon) using 535 fb-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+ e- collider. No evidence for these decays is observed, and we set 90% confidence level upper limits on the branching fractions of (2.0 - 4.1) × 10-8. These results improve upon our previously published upper limits by factors of 4.9 to 10. © 2008 Elsevier B.V. All rights reserved.