We have searched for a CP violation signature arising from an electric dipole moment (dτ) of the τ lepton in the e+e- → τ+τ- reaction. Using an optimal observable method and 29.5 fb-1 of data collected with the Belle detector at the KEKB collider at √s= 10.58 GeV, we find Re(dτ) = (1.15 ± 1.70) × 10-17 ecm and Im(dτ) = (-0.83 ± 0.86) × 10-17 ecm and set the 95% confidence level limits -2.2 x 10-17 < Re(dτ) < 4.5 × 10-17 ecm and -2.5 x 10-17 < Im(dτ) < 0.8 x 10-17 ecm.
|Number of pages||11|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2003 Jan 2|
Bibliographical noteFunding Information:
We would like to thank Professors K. Hagiwara, O. Nachtmann, and Z. Wa̧s for their constructive advice and many helpful discussions. We also wish to thank the KEKB accelerator group for the excellent operation of the KEKB accelerator. We gratefully acknowledge the support from the Ministry of Education, Culture, Sports, Science, and Technology of Japan, Grant-in-Aid for JSPS Fellows 01655 2001, and the Japan Society for the Promotion of Science; the Australian Research Council and the Australian Department of Industry, Science and Resources; the National Science Foundation of China under contract No. 10175071; the Department of Science and Technology of India; the BK21 program of the Ministry of Education of Korea and the CHEP SRC program of the Korea Science and Engineering Foundation; the Polish State Committee for Scientific Research under contract No. 2P03B 17017; the Ministry of Science and Technology of the Russian Federation; the Ministry of Education, Science and Sport of the Republic of Slovenia; the National Science Council and the Ministry of Education of Taiwan; and the US Department of Energy.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics