Measurements of branching fractions of τ lepton decays with one or more KS0

S. Ryu, I. Adachi, H. Aihara, D. M. Asner, V. Aulchenko, T. Aushev, A. M. Bakich, A. Bala, B. Bhuyan, A. Bobrov, A. Bondar, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, V. Chekelian, B. G. Cheon, K. Chilikin, R. ChistovK. Cho, V. Chobanova, S. K. Choi, Y. Choi, J. Dalseno, Z. DoleŽal, D. Dutta, S. Eidelman, D. Epifanov, H. Farhat, J. E. Fast, T. Ferber, V. Gaur, N. Gabyshev, S. Ganguly, A. Garmash, R. Gillard, Y. M. Goh, B. Golob, J. Haba, K. Hayasaka, H. Hayashii, Y. Hoshi, W. S. Hou, T. Iijima, K. Inami, A. Ishikawa, T. Iwashita, T. Julius, E. Kato, C. Kiesling, B. H. Kim, D. Y. Kim, J. B. Kim, J. H. Kim, K. T. Kim, M. J. Kim, S. K. Kim, Y. J. Kim, B. R. Ko, P. Kodyš, P. KriŽan, P. Krokovny, T. Kuhr, A. Kuzmin, Y. J. Kwon, S. H. Lee, J. Li, J. Libby, D. Liventsev, P. Lukin, J. Macnaughton, D. Matvienko, K. Miyabayashi, H. Miyata, R. Mizuk, A. Moll, T. Mori, R. Mussa, E. Nakano, M. Nakao, H. Nakazawa, M. Nayak, E. Nedelkovska, N. K. Nisar, S. Nishida, O. Nitoh, S. Okuno, S. L. Olsen, P. Pakhlov, G. Pakhlova, C. W. Park, H. Park, H. K. Park, T. K. Pedlar, M. Petrič, L. E. Piilonen, M. Ritter, M. Röhrken, A. Rostomyan, H. Sahoo, T. Saito, Y. Sakai, L. Santelj, T. Sanuki, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, D. Semmler, O. Seon, V. Shebalin, C. P. Shen, T. A. Shibata, J. G. Shiu, B. Shwartz, A. Sibidanov, F. Simon, Y. S. Sohn, A. Sokolov, E. Solovieva, S. Stanič, M. Starič, T. Sumiyoshi, U. Tamponi, G. Tatishvili, Y. Teramoto, M. Uchida, S. Uehara, Y. Unno, S. Uno, C. Van Hulse, P. Vanhoefer, G. Varner, A. Vinokurova, V. Vorobyev, M. N. Wagner, C. H. Wang, P. Wang, M. Watanabe, Y. Watanabe, E. Won, Y. Yamashita, S. Yashchenko, Y. Yook, C. Z. Yuan, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc

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Abstract

We report measurements of branching fractions of τ lepton decays to final states with a KS0 meson using a 669fb-1 data sample accumulated with the Belle detector at the KEKB asymmetric-energy e+e- collider. The inclusive branching fraction is measured to be B(τ-→KS0X-ντ)=(9. 15±0.01±0.15)×10-3, where X- can be anything; the exclusive branching fractions are B(τ-→π-KS0ντ)=(4.16±0. 01±0.08)×10-3, B(τ-→K-KS0ντ)=(7.40±0. 07±0.27)×10-4, B(τ-→π-KS0π0ντ)=(1. 93±0.02±0.07)×10-3, B(τ-→K-KS0π0ντ)=(7. 48±0.10±0.37)×10-4, B(τ-→π-KS0KS0ντ)=(2. 33±0.03±0.09)×10-4, B(τ-→π-KS0KS0π0ντ) =(2.00±0.22±0.20)×10-5, where the first uncertainty is statistical and the second is systematic. For each mode, the accuracy is improved over that of pre-B-factory measurements by a factor ranging from five to ten. In τ-→π-KS0KS0π0ντ decays, clear signals for the intermediate states τ-→π-f1(1285)ντ and τ-→K*- KS0π0ντ are observed.

Original languageEnglish
Article number072009
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume89
Issue number7
DOIs
Publication statusPublished - 2014 Apr 9

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Ryu, S., Adachi, I., Aihara, H., Asner, D. M., Aulchenko, V., Aushev, T., Bakich, A. M., Bala, A., Bhuyan, B., Bobrov, A., Bondar, A., Bonvicini, G., Bozek, A., Bračko, M., Browder, T. E., Červenkov, D., Chekelian, V., Cheon, B. G., Chilikin, K., ... Zupanc, A. (2014). Measurements of branching fractions of τ lepton decays with one or more KS0. Physical Review D - Particles, Fields, Gravitation and Cosmology, 89(7), [072009]. https://doi.org/10.1103/PhysRevD.89.072009