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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2010, vol. 81, p. -

Measurement of the branching fractions and the invariant mass distributions for τ-→h-h+h-ντ decays

Lee M. J., Aihara H., Arinstein K., Aulchenko V., Aushev T., Bakich A. M., Barberio E., Bay A., Belous K., Bhardwaj V., Bischofberger M., Bondar A., Bozek A., Bračko M., Browder T. E., Chang P., Chen A., Chen P., Cheon B. G., Cho I. S., Choi Y., Dalseno J., Das A., Dungel W., Eidelman S., Epifanov D., Fujikawa M., Gabyshev N., Garmash A., Ha H., Haba J., Han B. Y., Hasegawa Y., Hayasaka K., Hayashii H., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Iijima T., Inami K., Itoh R., Iwasaki M., Iwasaki Y., Julius T., Kah D. H., Kang J. H., Katayama N., Kawasaki T., Kiesling C., Kim H. J., Kim H. O., Kim J. H., Kim S. K., Kim Y. I., Kim Y. J., Ko B. R., Korpar S., Križan P., Krokovny P., Kumita T., Kuzmin A., Kwon Y. J., Kyeong S. H., Lange J. S., Lee S. H., Li J., Liu C., Liu Y., Liventsev D., Louvot R., MacNaughton J., Mandl F., McOnie S., Miyata H., Miyazaki Y., Mori T., Nakano E., Nakao M., Nakazawa H., Natkaniec Z., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okuno S., Olsen S. L.

We present a study of τ-→π -π+π-ντ, τ -→K-π+π-ντ, τ-→K-K+π-ντ, and τ-→K-K+K-ντ decays using a 666fb-1 data sample collected with the Belle detector at the KEKB asymmetric-energy e+e- collider at and near a center-of-mass energy of 10.58 GeV. The branching fractions are measured to be B(τ-→π-π+π -ντ)=(8.42±0.00-0.25+0.26)×10-2, B(τ-→K-π+π-ντ) =(3.30±0.01-0.17+0.16)×10-3, B(τ -→K-K+π-ντ)=(1. 55±0.01-0.05+0.06)×10-3, and B(τ -→K-K+K-ντ)=(3. 29±0.17-0.20+0.19)×10-5, where the first uncertainty is statistical and the second is systematic. These branching fractions do not include contributions from modes in which a π+π- pair originates from a KS0 decay. We also present the unfolded invariant mass distributions for these decays. © 2010 The American Physical Society.