Precise measurement of hadronic τ-decays with an η meson

K. Inami, T. Ohshima, H. Kaji, I. Adachi, H. Aihara, K. Arinstein, V. Aulchenko, T. Aushev, I. Bedny, V. Bhardwaj, A. Bondar, M. Bračko, T. E. Browder, M. C. Chang, Y. Chao, R. Chistov, I. S. Cho, Y. Choi, J. Dalseno, M. DashS. Eidelman, D. Epifanov, N. Gabyshev, B. Golob, J. Haba, K. Hara, K. Hayasaka, H. Hayashii, D. Heffernan, Y. Hoshi, W. S. Hou, H. J. Hyun, T. Iijima, A. Ishikawa, Y. Iwasaki, D. H. Kah, J. H. Kang, T. Kawasaki, H. Kichimi, H. O. Kim, S. K. Kim, Y. I. Kim, Y. J. Kim, P. Krokovny, R. Kumar, A. Kuzmin, Y. J. Kwon, S. H. Kyeong, J. S. Lange, J. S. Lee, M. J. Lee, S. E. Lee, A. Limosani, S. W. Lin, R. Louvot, F. Mandl, S. McOnie, T. Medvedeva, K. Miyabayashi, H. Miyata, Y. Miyazaki, R. Mizuk, E. Nakano, M. Nakao, H. Nakazawa, O. Nitoh, S. Noguchi, S. Ogawa, S. Okuno, H. Ozaki, P. Pakhlov, G. Pakhlova, C. W. Park, H. Park, H. K. Park, K. S. Park, L. S. Peak, L. E. Piilonen, A. Poluektov, Y. Sakai, O. Schneider, M. Shapkin, V. Shebalin, J. G. Shiu, B. Shwartz, J. B. Singh, S. Stanič, M. Starič, T. Sumiyoshi, M. Tanaka, G. N. Taylor, Y. Teramoto, S. Uehara, T. Uglov, S. Uno, Y. Usov, Y. Usuki, G. Varner, A. Vinokurova, C. H. Wang, P. Wang, X. L. Wang, Y. Watanabe, R. Wedd, E. Won, Y. Yamashita, Z. P. Zhang, V. Zhilich, V. Zhulanov, T. Zivko, A. Zupanc, O. Zyukova

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55 Citations (Scopus)


We have studied hadronic τ decay modes involving an η meson using 490 fb-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+ e- collider. The following branching fractions have been measured: B (τ- → K- η ντ) = (1.58 ± 0.05 ± 0.09) × 10- 4, B (τ- → K- π0 η ντ) = (4.6 ± 1.1 ± 0.4) × 10- 5, B (τ- → π- π0 η ντ) = (1.35 ± 0.03 ± 0.07) × 10- 3, B (τ- → π- KS0 η ντ) = (4.4 ± 0.7 ± 0.2) × 10- 5, and B (τ- → K* - η ντ) = (1.34 ± 0.12 ± 0.09) × 10- 4. These results are substantially more precise than previous measurements. The new measurements are compared with theoretical calculations based on the CVC hypothesis or the chiral perturbation theory. We also set upper limits on branching fractions for τ decays into K- KS0 η ντ, π- KS0 π0 η ντ, K- η η ντ, π- η η ντ and non-resonant K- π0 η ντ final states.

Original languageEnglish
Pages (from-to)209-218
Number of pages10
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number3
Publication statusPublished - 2009 Feb 23

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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