1999/09/30 by CDF Collaboration, A. A. Affolder, H. Akimoto +98 · 6 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Particle physics theoretical and experimental studies #hep-ex
paper · pdf · doi:10.1103/physrevd.61.072005
published as Phys.Rev.D61:072005,2000 · 36 pages, 9 figures, submitted to Phys.Rev.D, modifications to text for publication
arxiv created 1999/11/15 · openalex publication_date 2000/03/09 · arxiv updated 2012/08/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
This paper reports an updated measurement of the standard model CP violation parameter sin2\ensuremathβ using the CDF Detector at Fermilab. The entire run I data sample of 110 pb^\ensuremath-1 of proton-antiproton collisions at √(s)=1.8 TeV is used to identify a signal sample of \ensuremath∼400 \stackrel\ensuremath→BJ/\ensuremathψKS0 events, where J/\stackrel\ensuremath→\ensuremathψ\ensuremathμ+\ensuremathμ^\ensuremath- and KS0\ensuremath→\ensuremathπ+\ensuremathπ^\ensuremath-. 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\ensuremathβ=0.79_\ensuremath-0.44+0.41(stat+syst). This value of sin2\ensuremathβ is consistent with the standard model prediction, based upon existing measurements, of a large positive CP-violating asymmetry in this decay mode.