A Measurement of CP Violating Asymmetries in B0-->f0(980)K0s Decays

Abstract

We present preliminary measurements of the CP-violating asymmetries in the decay $B^0\to f_0(980)(\to {\pi }^{+}{\pi }^{-})K_s^0$. The results are obtained from a data sample of $209\times 10^6$ ${\rm Y}(4S)\to B\bar{B}$ decays collected with the BaBar detector at the PEP-II asymmetric-energy $B$ Factory at SLAC. From a time-dependent maximum-likelihood fit we measure the mixing-induced CP violation parameter $S=-0.95_{-0.23}^{+0.32}\pm 0.10$ and the direct CP violation parameter $C=-0.24\pm 0.31\pm 0.15$, where the first errors are statistical and the second systematic.

16 pages, 7 figures. Contributed to ICHEP 2004