A Measurement of $\sin 2β$ from $B\to J/ψK^0_S$ with the CDF detector

Details A Measurement of $\sin 2β$ from $B\to J/ψK^0_S$ with the CDF detector A Measurement of $\sin 2β$ from $B\to J/ψK^0_S$ with the CDF detector

1999-09-02

arxiv.org/abs/hep-ex/9909003v2

Phys.Rev.D61:072005,2000

Physics

High Energy Physics

High Energy Physics - Experiment

36 pages, 9 figures, submitted to Phys.Rev.D, modifications to text for publication

Scientific paper

10.1103/PhysRevD.61.072005

This paper reports an updated measurement of the Standard Model CP violation parameter $\sin2\beta$ using the CDF Detector at Fermilab. The entire Run I data sample of 110 pb$^{-1}$ of proton antiproton collisions at $\sqrt{s}=1.8 TeV$ is used to identify a signal sample of $\sim 400$ $B \to J/\psi K^0_S$ events, where $J/\psi \to \mu^+\mu^-$ and $K_S^0 \to \pi^+\pi^-$. 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 $\sin2\beta = 0.79 {+0.41\atop-0.44}$(stat+syst). This value of $\sin 2 \beta$ is consistent with the Standard Model prediction, based upon existing measurements, of a large positive CP violating asymmetry in this decay mode.

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