First Measurement of the CP-Violating Asymmetries with BaBar
We report on a preliminary measurement of time-dependent CP-violating asymmetries in B{sup 0} {yields} J/{psi} K{sub s}{sup 0} and B{sup 0} {yields} {psi}(2S) K{sub s}{sup 0} decays recorded by the BABAR detector at the PEP-II asymmetric B Factory at SLAC. The data sample consisted of 9.0 fb{sup -1} collected at the {Upsilon}(4S) resonance and 0.8 fb{sup -1} off-resonance. One of the pair of neutral B mesons produced at the {Upsilon}(4S) was fully reconstructed, while the flavor of the other neutral B meson was tagged at the time of its decay. The value of the asymmetry amplitude, sin2{beta}, was determined from a maximum likelihood fit to the time distribution of 120 tagged candidates to be sin2{beta} = 0.12 {+-} 0.37(stat.) {+-} 0.09(syst.) (preliminary).
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 784867
- Report Number(s):
- SLAC-PUB-8738; TRN: US0108650
- Resource Relation:
- Other Information: PBD: 2 Feb 2001
- Country of Publication:
- United States
- Language:
- English
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