Measurement of sin2 from BJ/KS0 with the CDF detector
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This paper reports an updated measurement of the standard model CP violation parameter sin 2 using the CDF Detector at Fermilab. The entire run I data sample of 110 pb-1 of proton-antiproton collisions at s =1.8 TeV is used to identify a signal sample of 400 BJ/KS0 events, where J/+- and KS0 +-. The flavor of the neutral B meson is identified at the time of production by combining information from three tagging algorithms: a same-side tag, a jet-charge tag, and a soft-lepton tag. A maximum likelihood fitting method is used to determine sin2=0.19-0.44+0.41(stat+syst). This value of sin 2 is consistent with the standard model prediction, based upon existing measurements, of a large positive CP-violating asymmetry in this decay mode. 2000 The American Physical Society.