Measurement of CP Violation in B0 to ΦK0, and of Branching Fraction and CP Violation in B0 → F0(980) K$$0\atop{S}$$
- Univ. of Wisconsin, Madison, WI (United States)
The authors measure the time-dependent CP asymmetry parameters in B0 → K+K-K0 based on a data sample of approximately 277 million B-meson pairs recorded at the Y(4S) resonance with the BABAR detector at the PEP-II B-meson Factory at SLAC. They reconstruct two-body B0 decays to Φ(1020)K$$0\atop{S}$$ and Φ(1020)K$$0\atop{L}$$. Using a time-dependent maximum-likelihood fit, they measure sin2βeff(ΦK0) = 0.48 ± 0.28 ± 0.10, and C(ΦK0) = 0.16 ± 0.25 ± 0.09, where the first error is statistical, and the second is systematic. They also present measurements of the CP-violating asymmetries in the decay B0 → f0(→ {pi}+π-)K$$0\atop{S}$$. The results are obtained from a data sample of 209 x 10{sup 6} Y(4S) → B$$\bar{B}$$ decays, also collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. From a time-dependent maximum-likelihood fit they measure the mixing-induced CP violation parameter S(f0(980)K$$0\atop{S}$$) = - sin 2βefff0(980)K$$0\atop{S}$$ = -0.95$$+0.32\atop{-0.23}$$ ± 0.10 and the direct CP violation parameter C(f0(980)K$$0\atop{S}$$) = - 0.24 ± 0.31 ± 0.15, where the first errors are statistical and the second systematic. Finally, they present a measurement of the branching fraction of the decay B0 → f0(→ π+π-)K$$0\atop{S}$$. From a time-dependent maximum likelihood fit to a data sample of 123 x 106 Y(4S) → B$$\bar{B}$$ decays they find 93.6 ± 13.6 ± 6.4 signal events corresponding to a branching fraction of β(B0 → f0(980)(→ π+π-)K0) = (6.0 ± 0.9 ± 0.6 ± 1.2) x 10-6, where the first error is statistical, the second systematic, and the third due to model uncertainties.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515;
- OSTI ID:
- 925459
- Report Number(s):
- SLAC--R-895
- Country of Publication:
- United States
- Language:
- English
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