Measurement of the CP-violation parameter sin(2β) in B0 d/B-0 d → J/ψK0 S decays

CDF collaboration

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We present a measurement of the time-dependent asymmetry in the rate for B-0 d versus B0 d decays to J/ψK0 S. 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)2. A total of 198 ± 17 B0 d/B¯0 d decays were observed in 99¯ collisions at √s = 1.8 TeV by the CDF detector at the Fermilab Tevatron. B0 d and B¯0 d 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).

Original languageEnglish (US)
Pages (from-to)5513-5518
Number of pages6
JournalPhysical review letters
Issue number25
StatePublished - 1998

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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