Measurement of the CP-Violating Asymmetry Amplitude sin2b
We present results on time-dependent CP-violating asymmetries in neutral B decays to several CP eigenstates. The measurements use a data sample of about 88 million {Upsilon}(4S) {yields} B{bar B} decays collected between 1999 and 2002 with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We study events in which one neutral B meson is fully reconstructed in a final state containing a charmonium meson and the other B meson is determined to be either a B{sup 0} or {bar B}{sup 0} from its decay products. The amplitude of the CP-violating asymmetry, which in the Standard Model is proportional to sin2{beta}, is derived from the decay-time distributions in such events. We measure sin2{beta} = 0.741 {+-} 0.067 (stat) {+-} 0.033 (syst) and |{lambda}| = 0.948 {+-} 0.051 (stat) {+-} 0.017 (syst). The magnitude of {lambda} is consistent with unity, in agreement with the Standard Model expectation of no direct CP violation in these modes.
- 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:
- 799121
- Report Number(s):
- SLAC-PUB-9293; TRN: US0206116
- Resource Relation:
- Other Information: PBD: 17 Jul 2002
- Country of Publication:
- United States
- Language:
- English
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