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, Eunil Won, Y. Yamashita, Z. P. Zhang, V. Zhilich, V. Zhulanov, T. Zivko, A. Zupanc, O. Zyukova

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Abstract

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- KS 0 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- KS 0 η ντ, π- KS 0 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
Volume672
Issue number3
DOIs
Publication statusPublished - 2009 Feb 23

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Inami, K., Ohshima, T., Kaji, H., Adachi, I., Aihara, H., Arinstein, K., Aulchenko, V., Aushev, T., Bedny, I., Bhardwaj, V., Bondar, A., Bračko, M., Browder, T. E., Chang, M. C., Chao, Y., Chistov, R., Cho, I. S., Choi, Y., Dalseno, J., ... Zyukova, O. (2009). Precise measurement of hadronic τ-decays with an η meson. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 672(3), 209-218. https://doi.org/10.1016/j.physletb.2009.01.047