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We report results from a study of events with a leading antiproton of beam

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 Ϫ1 of proton-antiproton collisions at ͱs ϭ1.8 TeV is used to identify a signal sample of ϳ400 B→J/ K S 0 events, where J/→ ϩ Ϫ and K S 0 → ϩ Ϫ. 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 sin 2␤ϭ0.79 Ϫ0.44 ϩ0.41 (statϩsyst). 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.

W e report a measurement o f the diffraction dissociation differential cross section d 2 u s~/ d M 2 d t for ?Sp + pX at f i = 546 and 1800 G e V , M 2 / s < 0.2 and 0 < -t < 0.4 G~v~. Our results are compared t o theoretical predictions and t o extrapolations from experimental results at lower energies. PACS number(s): 13.85.Hd, 12.40.Nn

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