Study of τ- → KS π- ντ decay at Belle

D. Epifanov, I. Adachi, H. Aihara, K. Arinstein, V. Aulchenko, T. Aushev, A. M. Bakich, V. Balagura, E. Barberio, I. Bedny, K. Belous, U. Bitenc, I. Bizjak, A. Bondar, A. Bozek, M. Bračko, T. E. Browder, Y. Chao, A. Chen, K. F. ChenW. T. Chen, B. G. Cheon, C. C. Chiang, R. Chistov, I. S. Cho, Y. Choi, Y. K. Choi, J. Dalseno, M. Dash, A. Drutskoy, S. Eidelman, G. Gokhroo, B. Golob, H. Ha, J. Haba, K. Hayasaka, H. Hayashii, M. Hazumi, D. Heffernan, T. Hokuue, Y. Hoshi, W. S. Hou, Y. B. Hsiung, H. J. Hyun, T. Iijima, K. Ikado, K. Inami, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, D. H. Kah, H. Kaji, J. H. Kang, H. Kawai, T. Kawasaki, H. Kichimi, H. O. Kim, S. K. Kim, Y. J. Kim, P. Križan, P. Krokovny, R. Kumar, C. C. Kuo, A. Kuzmin, Y. J. Kwon, J. S. Lee, M. J. Lee, S. E. Lee, T. Lesiak, J. Li, A. Limosani, S. W. Lin, Y. Liu, D. Liventsev, F. Mandl, D. Marlow, T. Matsumoto, A. Matyja, S. McOnie, T. Medvedeva, H. Miyata, Y. Miyazaki, R. Mizuk, G. R. Moloney, T. Mori, E. Nakano, M. Nakao, H. Nakazawa, Z. Natkaniec, S. Nishida, O. Nitoh, S. Ogawa, T. Ohshima, Y. Onuki, W. Ostrowicz, H. Ozaki, P. Pakhlov, G. Pakhlova, H. Palka, C. W. Park, H. Park, K. S. Park, L. S. Peak, R. Pestotnik, L. E. Piilonen, A. Poluektov, H. Sahoo, Y. Sakai, O. Schneider, R. Seidl, K. Senyo, M. E. Sevior, M. Shapkin, H. Shibuya, B. Shwartz, A. Sokolov, 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. Tsuboyama, S. Uehara, K. Ueno, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Usov, G. Varner, K. Vervink, S. Villa, A. Vinokurova, C. H. Wang, P. Wang, Y. Watanabe, R. Wedd, Eunil Won, B. D. Yabsley, A. Yamaguchi, Y. Yamashita, M. Yamauchi, C. Z. Yuan, Z. P. Zhang, V. Zhilich, A. Zupanc

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Abstract

We present a study of the decay τ- → KS π- ντ using a 351  fb-1 data sample collected with the Belle detector. The analysis is based on 53, 110 lepton-tagged signal events. The measured branching fraction B (τ- → KS π- ντ) = (0.404 ± 0.002 (stat .) ± 0.013 (syst .)) % is consistent with the world average value and has better accuracy. An analysis of the KS π- invariant mass spectrum reveals contributions from the K* (892)- as well as other states. For the first time the K* (892)- mass and width have been measured in τ decay: M (K* (892)-) = (895.47 ± 0.20 (stat .) ± 0.44 (syst .) ± 0.59 (mod .))   MeV / c2, Γ (K* (892)-) = (46.2 ± 0.6 (stat .) ± 1.0 (syst .) ± 0.7 (mod .))   MeV. The K* (892)- mass is significantly different from the current world average value.

Original languageEnglish
Pages (from-to)65-73
Number of pages9
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume654
Issue number3-4
DOIs
Publication statusPublished - 2007 Oct 11

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Keywords

  • K
  • Tau

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Epifanov, D., Adachi, I., Aihara, H., Arinstein, K., Aulchenko, V., Aushev, T., Bakich, A. M., Balagura, V., Barberio, E., Bedny, I., Belous, K., Bitenc, U., Bizjak, I., Bondar, A., Bozek, A., Bračko, M., Browder, T. E., Chao, Y., Chen, A., ... Zupanc, A. (2007). Study of τ- → KS π- ντ decay at Belle. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 654(3-4), 65-73. https://doi.org/10.1016/j.physletb.2007.08.045