Measurements of the branching fraction and CP-violation asymmetries in B-0 -> f(0)(980)K-S(0)

B. Aubert, J.Y. Chen, R.F. Schmitz, S. Chen, L.L. Zhang, M.C. Simani, M.A. Baak, H.J. Bulten, G. Raven, P. David, N. de Groot, Z. Yu

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We present measurements of the branching fraction and CP-violating asymmetries in the decay B0→f0(980)K0S. The results are obtained from a data sample of 123×106 Υ(4S)→B¯¯¯B decays. From a time-dependent maximum likelihood fit, we measure the branching fraction B(B0→f0(980)(→π+π−)K0)=(6.0±0.9±0.6±1.2)×10−6, the mixing-induced CP violation parameter S=−1.62+0.56−0.51±0.09±0.04, and the direct CP violation parameter C=0.27±0.36±0.10±0.07, where the first errors are statistical, the second systematic, and the third due to model uncertainties. We measure the f0(980) mass and width to be mf0(980)=(980.6±4.1±0.5±4.0)   MeV/c2 and Γf0(980)=(43+12−9±3±9)   MeV/c2, respectively.
Original languageEnglish
Article number041802
JournalPhysical Review Letters
Issue number4
Publication statusPublished - 2 Feb 2005


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