Measurements of branching fractions of Ï„ lepton decays with one or more KS0

Date Issued
09-04-2014
Author(s)
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.
BraÄ ko, M.
Browder, T. E.
ÄŒervenkov, D.
Chekelian, V.
Cheon, B. G.
Chilikin, K.
Chistov, R.
Cho, K.
Chobanova, V.
Choi, S. K.
Choi, Y.
Dalseno, J.
DoleŽal, Z.
Dutta, D.
Eidelman, S.
Epifanov, D.
Farhat, H.
Fast, J. E.
Ferber, T.
Gaur, V.
Gabyshev, N.
Ganguly, S.
Garmash, A.
Gillard, R.
Goh, Y. M.
Golob, B.
Haba, J.
Hayasaka, K.
Hayashii, H.
Hoshi, Y.
Hou, W. S.
Iijima, T.
Inami, K.
Ishikawa, A.
Iwashita, T.
Julius, T.
Kato, E.
Kiesling, C.
Kim, B. H.
Kim, D. Y.
Kim, J. B.
Kim, J. H.
Kim, K. T.
Kim, M. J.
Kim, S. K.
Kim, Y. J.
Ko, B. R.
Kodyš, P.
KriŽan, P.
Krokovny, P.
Kuhr, T.
Kuzmin, A.
Kwon, Y. J.
Lee, S. H.
Li, J.
Indian Institute of Technology, Madras
Liventsev, D.
Lukin, P.
Macnaughton, J.
Matvienko, D.
Miyabayashi, K.
Miyata, H.
Mizuk, R.
Moll, A.
Mori, T.
Mussa, R.
Nakano, E.
Nakao, M.
Nakazawa, H.
Nayak, M.
Nedelkovska, E.
Nisar, N. K.
Nishida, S.
Nitoh, O.
Okuno, S.
Olsen, S. L.
Pakhlov, P.
Pakhlova, G.
Park, C. W.
Park, H.
Park, H. K.
Pedlar, T. K.
PetriÄ , M.
Piilonen, L. E.
Ritter, M.
Röhrken, M.
Rostomyan, A.
DOI
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. © 2014 American Physical Society.
Volume
89