Measurement of the CP-Violation Parameter sin(2β) in Bd0/B¯d 0J/ψKS0 Decays

Phys. Rev. Lett. 81, 5513 – Published 21 December 1998
F. Abe et al. (CDF Collaboration)


We present a measurement of the time-dependent asymmetry in the rate for B¯d 0 versus Bd0 decays to J/ψKS0. A nonzero asymmetry would be an indication of CP violation, and within the standard model this may be used to measure the CP-violation parameter sin(2β). A total of 198±17 Bd0/B¯d 0 decays were observed in pp¯ collisions at s=1.8 TeV by the CDF detector at the Fermilab Tevatron. Bd0 and B¯d 0 are distinguished by a technique based on charge correlations from hadronization of the b quark. Our analysis results in sin(2β)=1.8±1.1(stat)±0.3(syst).


  • Received 23 June 1998
  • Published in the issue dated 21 December 1998

© 1998 The American Physical Society

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