Measurements of the Branching Fraction and CP-Violation Asymmetries in B^0-->f0(980)Ks

Abstract

We present measurements of the branching fraction and CP-violating asymmetries in the decay $B^0\to f_0(980)K_S^0$. The results are obtained from a data sample of $123\times 10^6$ ${\rm Y}(4S)\to B\bar{B}$ decays. From a time-dependent maximum likelihood fit we measure the branching fraction ${\cal B}(\Bz\to f_0(980)(\toπ^+π^-)K^0)=(6.0\pm0.9\pm0.6\pm1.2)\times 10^{-6}$, the mixing-induced CP violation parameter $S=-1.62_{-0.51}^{+0.56}\pm 0.09\pm 0.04$ and the direct CP violation parameter $C=0.27\pm 0.36\pm 0.10\pm 0.07$, where the first errors are statistical, the second systematic and the third due to model uncertainties. We measure the $f_0(980)$ mass and width to be $m_{f_0(980)}=(980.6\pm 4.1\pm 0.5\pm 4.0)\mathrm{MeV}/c^2$ and ${\Gamma }_{f_0(980)}=(43_{-9}^{+12}\pm 3\pm 9)\mathrm{MeV}/c^2$, respectively.

submitted to Phys. Rev. Lett. 7 pages, 2 figures

References in corpus (3)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Measurement of the Time-Dependent CP Asymmetry in the B0 --> Phi K0 Decay
• Branching Fractions and CP Asymmetries in B0 --> K+ K- K0S and B+ --> K+ K0S K0S

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