Improved measurement of CP-violation in B → (cc̄) K (*)0 decays

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We present results on time-dependent CP asymmetries in neutral B decays. The amplitude of the CP asymmetry, sin2β in the Standard Model, is derived from decay-time distributions from 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 B0 or B̄0 from its decay products. Using data collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, we measure sin2β = 0.722 ± 0.040(stat) ± 0.023(syst) and cos2β = 2.72-0.79 +0.50(stat) ± 0.27(syst), determining the sign of cos2β to be positive at 86% CL.

Original languageEnglish (US)
Pages (from-to)3522-3526
Number of pages5
JournalInternational Journal of Modern Physics A
Issue number15
StatePublished - Jun 20 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Astronomy and Astrophysics


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