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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2008, vol. 666, p. 16-22

New search for τ → μ γ and τ → e γ decays at Belle

Hayasaka K., Abe K., Adachi I., Aihara H., Anipko D., Arinstein K., Aulchenko V., Bakich A. M., Barberio E., Bay A., Bedny I., Belous K., Bitenc U., Bizjak I., Bondar A., Bozek A., Bračko M., Brodzicka J., Chang M. C., Chang P., Chao Y., Chen A., Chen W. T., Cheon B. G., Chistov R., Choi Y., Choi Y. K., Dalseno J., Danilov M., Dash M., Drutskoy A., Eidelman S., Epifanov D., Fratina S., Gabyshev N., Gershon T., Go A., Golob B., Ha H., Haba J., Hara K., Hara T., Hayashii H., Hazumi M., Heffernan D., Hokuue T., Hoshi Y., Hou S., Hou W. S.

We report on a search for the lepton flavor violating τ- → μ- γ and τ- → e- γ decays based on 535 fb-1 of data accumulated at the Belle experiment. No signal is found and we set 90% confidence level upper limits on the branching ratios B (τ- → μ- γ) < 4.5 × 10-8 and B (τ- → e- γ) < 1.2 × 10-7. © 2008 Elsevier B.V.