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Search for lepton flavor violating τ decays into three leptons

Abe K., Adachi I., Aihara H., Arinstein K., Aso T., Aulchenko V., Aushev T., Aziz T., Bahinipati S., Bakich A. M., Balagura V., Ban Y., Banerjee S., Barberio E., Bay A., Bedny I., Belous K., Bhardwaj V., Bitenc U., Blyth S., Bondar A., Bozek A., Bracko M., Brodzicka J., Browder T. E., Chang M. C., Chang P., Chao Y., Chen A., Chen K. F., Chen W. T., Cheon B. G., Chiang C. C., Chistov R., Cho I. S., Choi S. K., Choi Y., Choi Y. K., Cole S., Dalseno J., Danilov M., Das A., Dash M., Dragic J., Drutskoy A., Eidelman S., Epifanov D., Fratina S., Fujii H., Fujikawa M., Gabyshev N., Garmash A., Go A., Gokhroo G., Goldenzweig P., Golob B., Grosse Perdekamp M., Guler H., Ha H., Haba J., Hara K., Hara T., Hasegawa Y., Hastings N. C., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Higuchi T., Hinz L., Hoedlmoser H., Hokuue T., Horii Y., Hoshi Y., Hoshina K., Hou S., Hou W. S., Hsiung Y. B., Hyun H. J., Igarashi Y., Iijima T., Ikado K., Inami K., Ishikawa A., Ishino H., Itoh R., Iwabuchi M., Iwasaki M., Iwasaki Y., Jacoby C., Joshi N. J., Kaga M., Kah D. H., Kaji H., Kajiwara S., Kakuno H.

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 between 2.0 × 10-8 and 4.1 × 10 -8. These results improve the best previously published upper limits by factors from 4.9 to 7.0.