Abstract:
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This thesis presents a measurement of the time-dependent asymmetry in
the rate of $\overline{B}{^0_d}$ versus $B^0_d$ decays to $J/\psi K^0_S$.
In the context of the Standard Model this is interpreted as a
measurement of the $CP$ violation parameter $\sin(2\beta)$.  A total
of $198\pm 17$ $B^0_d/\overline{B}{^0_d}$ decays were observed in
$p\bar{p}$ collisions at $\sqrt{s} = 1.8$ TeV by the CDF detector at
the Fermilab Tevatron. The initial $B$ flavor (whether $\BZ$ or
$\BZB$) is determined by a same-side flavor tagging technique.  The
analysis results in
$\sin(2\beta) = 1.8\pm 1.1\,{\rm (stat.)}\pm 0.3\,{\rm (syst.)}$.

This analysis demonstrates the feasibility of studying $CP$ violation
in the $\BZ$--$\BZB$ system at a hadron collider.  By applying the
methods used in this analysis, future, higher-statistics experiments
should be able to tightly constrain the parameters of the Standard
Model.

Portions of this analysis have been submitted for Publication.
The article ``{Measurement of the $B^0_d$-$\overline{B}{^0_d}$ 
flavor oscillation frequency and study of same side flavor tagging 
of $B$ mesons  in $p\bar p$ collisions}'' has been submitted
to {\em Phys. Rev. D}; the preprint for this article
is {\bf FERMILAB-Pub-98/188-E}.
The article ``{Measurement of the $CP$-Violation Parameter $\sin(2\beta)$
in $B^0_d/\overline{B}{^0_d} \rightarrow J/\psi K^0_S$ Decays}''
has been submitted to {\em Phys. Rev. Lett.}; the preprint
for this article is {\bf FERMILAB-Pub-98/189-E}.



Posted to /cdf/pub/thesis/cdf4767_Measurement_sin2beta.ps
    http://www-cdf.fnal.gov/thesis/cdf4767_Measurement_sin2beta.ps

Posted by kkelley@cdfsga