Journal article

New search for tau -> mu gamma and tau -> e gamma decays at Belle

K Hayasaka, K Abe, I Adachi, H Aihara, D Anipko, K Arinstein, V Aulchenko, AM Bakich, E Barberio, A Bay, I Bedny, K Belous, U Bitenc, I Bizjak, A Bondar, A Bozek, M Bracko, J Brodzicka, M-C Chang, P Chang Show all



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.


Awarded by Chinese Academy

Awarded by Korea Science and Engineering Foundation

Awarded by Polish State Committee for Scientific Research

Awarded by National Research Foundation of Korea

Funding Acknowledgements

We thank the KEKB group for the excellent operation of the accelerator, the KEK cryogenics group for the efficient operation of the solenoid, and the KEK computer group and the National Institute of Informatics for valuable computing and Super-SINET network support. We acknowledge support from the Ministry of Education, Culture, Sports, Science, and Technology of Japan and the Japan Society for the Promotion of Science; the Australian Research Council and the Australian Department of Education, Science and Training; the National Science Foundation of China and the Knowledge Innovation Program of the Chinese Academy of Sciences under contract No. 10575109 and IHEP-U-503; the Department of Science and Technology of India; the BK21 program of the Ministry of Education of Korea, and the CHEP SRC program and Basic Research program (grant No. R01-2005-000-10089-0) of the Korea Science and Engineering Foundation; the Polish State Committee for Scientific Research under contract No. 2PO3B 01324; the Ministry of Science and Technology of the Russian Federation; the Slovenian Research Agency; the Swiss National Science Foundation; the National Science Council and the Ministry of Education of Taiwan; and the US Department of Energy.