We have searched for the lepton-flavor-violating decays τ- decays into ℓ-KS0 and ℓ-KS0KS0 (ℓ=e or μ), using a data sample of 671 fb-1 collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. No evidence for a signal was found in any of the decay modes, and we set the following upper limits for the branching fractions: B(τ-→e-KS0)<2.6 ×10-8, B(τ-→μ-KS0)<2 .3×10-8, B(τ-→e-KS0KS 0)<7.1×10-8 and B(τ-→μ-KS0 KS0)<8.0×10-8 at the 90% confidence level.
|Number of pages||6|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2010 Aug|
Bibliographical noteFunding Information:
We are grateful to M. Herrero for useful discussions. 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 SINET3 network support. We acknowledge support from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan , the Japan Society for the Promotion of Science (JSPS) , and the Tau-Lepton Physics Research Center of Nagoya University ; the Australian Research Council and the Australian Department of Industry, Innovation, Science and Research ; the National Natural Science Foundation of China under contract Nos. 10575109 , 10775142 , 10875115 and 10825524 ; the Ministry of Education, Youth and Sports of the Czech Republic under contract No. LA10033 ; the Department of Science and Technology of India ; the BK21 and WCU program of the Ministry Education Science and Technology, National Research Foundation of Korea , and NSDC of the Korea Institute of Science and Technology Information ; the Polish Ministry of Science and Higher Education ; the Ministry of Education and Science of the Russian Federation and the Russian Federal Agency for Atomic Energy ; the Slovenian Research Agency ; the Swiss National Science Foundation ; the National Science Council and the Ministry of Education of Taiwan ; and the U.S. Department of Energy . This work is supported by a Grant-in-Aid from MEXT for Science Research in a Priority Area (“New Development of Flavor Physics”), and from JSPS for Creative Scientific Research (“Evolution of Tau-lepton Physics”).
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics