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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2004, vol. 93, p. 081803-1

Search for the Lepton-Flavor-Violating Decay τ- → μ-η at Belle

Enari Y., Abe K., Abe K., Abe T., Adachi I., Aihara H., Asano Y., Aso T., Aulchenko V., Aushev T., Bakich A. M., Ban Y., Bedny I., Bizjak I., Bondar A., Bozek A., Bračko M., Browder T. E., Chao Y., Cheon B. G., Choi S. K., Choi Y., Choi Y. K., Chuvikov A., Danilov M., Dong L. Y., Eidelman S., Eiges V., Epifanov D., Fukunaga C., Gabyshev N., Garmash A., Gershon T., Gokhroo G., Golob B., Handa F., Hara T., Hayasaka K., Hayashii H., Hazumi M., Hokuue T., Hoshi Y., Hou W. S., Huang H. C., Iijima T., Inami K., Ishikawa A., Itoh R., Iwasaki H., Iwasaki M., Iwasaki Y., Kang J. H., Kang J. S., Kataoka S. U., Katayama N., Kawai H., Kawasaki T., Kichimi H., Kim H. J., Kim J. H., Kinoshita K., Koppenburg P., Korpar S., Križan P., Krokovny P., Kulasiri R., Kuzmin A., Kwon Y. J., Leder G., Lee S. H., Lesiak T., Lin S. W., MacNaughton J., Mandl F., Matsumoto T., Matyja A., Mitaroff W., Miyake H., Miyata H., Moloney G. R., Nagamine T., Nakano E., Nakao M., Nakazawa H., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Ostrowicz W., Ozaki H., Pakhlov P., Park C. W., Park H., Park K. S.

The lepton flavor violating decay τS-S → μ-η was investigated using data sample of 84.3 fb-1 accumulated with the Belle detector at KEK. The detection of η meson was observed through the decay modes of η→γγ and π+π -π0. The minimum photon energy requirement was reduced from 0.1 to 0.005 GeV, as photons from this decay were found to have softer energy distribution compared to those in η→γγ. The results show that an upper limit for branching fraction B < 3.4×10-7 at about 90% confidence level.