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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2003, vol. 551, p. 16-26

Search for the electric dipole moment of the τ lepton

Inami K., Abe K., Abe K., Abe R., Abe T., Adachi I., Aihara H., Akatsu M., Asano Y., Aso T., Aulchenko V., Aushev T., Bakich A. M., Ban Y., Banas E., Behera P. K., Bizjak I., Bondar A., Browder T. E., Chang P., Chao Y., Cheon B. G., Chistov R., Choi Y., Choi Y. K., Dong L. Y., Eidelman S., Eiges V., Enari Y., Fukunaga C., Gabyshev N., Garmash A., Gershon T., Golob B., Hagner C., Handa F., Hara T., Hayashii H., Hazumi M., Higuchi I., Higuchi T., Hokuue T., Hoshi Y., Hou W. S., Huang H. C., Igaki T., Iijima T., Ishikawa A., Ishino H., Itoh R., Iwasaki H., Jang H. K., Kang J. H., Kang J. S., Katayama N., Kawai H., Kawakami Y., Kawamura N., Kawasaki T., Kichimi H., Kim H. O., Kim Hyunwoo, Kim J. H., Kim S. K., Korpar S., Krokovny P., Kulasiri R., Kuzmin A., Kwon Y. J., Lange J. S., Leder G., Lee S. H., Li J., Liventsev D., Lu R. S., Macnaughton J., Mandl F., Matsuishi T., Matsumoto S., Matsumoto T., Mitaroff W., Miyake H., Miyata H., Nagamine T., Nagasaka Y., Nakadaira T., Nakano E., Nakao M., Nam J. W., Nishida S., Nozaki T., Ogawa S., Ohshima T., Okabe T., Okuno S., Olsen S. L.

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. © 2002 Elsevier Science B.V. All rights reserved.