Search for lepton flavor violating τ- decays into ℓ- η, ℓ- η and ℓ- π0

Y. Miyazaki, I. Adachi, H. Aihara, D. Anipko, K. Arinstein, V. Aulchenko, T. Aziz, A. M. Bakich, E. Barberio, A. Bay, I. Bedny, K. Belous, U. Bitenc, I. Bizjak, A. Bondar, M. Bračko, T. E. Browder, A. Chen, W. T. Chen, B. G. CheonY. Choi, Y. K. Choi, J. Dalseno, S. Eidelman, D. Epifanov, S. Fratina, N. Gabyshev, A. Go, A. Gorišek, H. Ha, J. Haba, K. Hayasaka, H. Hayashii, M. Hazumi, D. Heffernan, T. Hokuue, Y. Hoshi, S. Hou, W. S. Hou, T. Iijima, A. Imoto, K. Inami, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, H. Kaji, P. Kapusta, H. Kawai, T. Kawasaki, H. Kichimi, Y. J. Kim, S. Korpar, P. Križan, P. Krokovny, R. Kulasiri, R. Kumar, C. C. Kuo, A. Kuzmin, Y. J. Kwon, M. J. Lee, T. Lesiak, S. W. Lin, F. Mandl, T. Matsumoto, H. Miyake, H. Miyata, T. Nagamine, Y. Nagasaka, M. Nakao, S. Nishida, O. Nitoh, S. Ogawa, T. Ohshima, S. Okuno, Y. Onuki, H. Ozaki, P. Pakhlov, G. Pakhlova, H. Park, L. S. Peak, R. Pestotnik, L. E. Piilonen, A. Poluektov, H. Sahoo, Y. Sakai, N. Satoyama, T. Schietinger, O. Schneider, J. Schümann, C. Schwanda, A. J. Schwartz, K. Senyo, M. E. Sevior, H. Shibuya, B. Shwartz, V. Sidorov, J. B. Singh, A. Somov, N. Soni, S. Stanič, M. Starič, H. Stoeck, T. Sumiyoshi, F. Takasaki, K. Tamai, M. Tanaka, G. N. Taylor, Y. Teramoto, X. C. Tian, I. Tikhomirov, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, P. Urquijo, Y. Usov, G. Varner, S. Villa, A. Vinokurova, C. H. Wang, M. Watanabe, Y. Watanabe, E. Won, A. Yamaguchi, Y. Yamashita, M. Yamauchi, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc

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Abstract

We have searched for lepton-flavor-violating τ decays with a pseudoscalar meson (η, η and π0) using a data sample of 401 fb-1 collected with the Belle detector at the KEKB asymmetric-energy e+ e- collider. No evidence for these decays is found and we set the following upper limits on the branching fractions: B (τ- → e- η) < 9.2 × 10-8, B (τ- → μ- η) < 6.5 × 10-8, B (τ- → e- η) < 1.6 × 10-7, B (τ- → μ- η) < 1.3 × 10-7, B (τ- → e- π0) < 8.0 × 10-8 and B (τ- → μ- π0) < 1.2 × 10-7 at the 90% confidence level. These results improve our previously published upper limits by factors from 2.3 to 6.3.

Original languageEnglish
Pages (from-to)341-350
Number of pages10
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume648
Issue number5-6
DOIs
Publication statusPublished - 2007 May 17

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Miyazaki, Y., Adachi, I., Aihara, H., Anipko, D., Arinstein, K., Aulchenko, V., Aziz, T., Bakich, A. M., Barberio, E., Bay, A., Bedny, I., Belous, K., Bitenc, U., Bizjak, I., Bondar, A., Bračko, M., Browder, T. E., Chen, A., Chen, W. T., ... Zupanc, A. (2007). Search for lepton flavor violating τ- decays into ℓ- η, ℓ- η and ℓ- π0. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 648(5-6), 341-350. https://doi.org/10.1016/j.physletb.2007.03.027