First CP Violation Results from BABAR
The authors present 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} decay recorded by the BABAR detector at the PEP-II asymmetric B Factory at SLAC. The data sample consists of 9.0 fb{sup -1} collected at the {Upsilon}(4S) resonance and 0.8 fb{sup -1} off-resonance. One of the neutral B mesons, produced in pairs at the {Upsilon}(4S), is fully reconstructed. The flavor of the other neutral B meson is tagged at the time of its decay, mainly with the charge of identified leptons and kaons. The time difference between the decays is determined by measuring the distance between the decay vertices. Wrong-tag probabilities and the time resolution function are measured with samples of fully-reconstructed semileptonic and hadronic neutral B final states. The value of the asymmetry amplitude, sin2{beta}, is determined from a maximum likelihood fit to the time distribution of 120 tagged B{sup 0} {yields} J/{psi}K{sub s}{sup 0} and B{sup 0} {yields} {psi}(2S)K{sub s}{sup 0} candidates: sin2{beta} = 0.12 {+-} 0.37 (stat) {+-} 0.09 (syst).
- 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:
- 784765
- Report Number(s):
- SLAC-PUB-8698; TRN: US0108581
- Resource Relation:
- Other Information: PBD: 7 Nov 2000
- Country of Publication:
- United States
- Language:
- English
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