DOI 10.1007/s100529900099
Extracting
from
and

R. Fleischer
Theory Division, CERN, CH-1211 Geneva 23, Switzerland
Received: 24 March 1999 / Published online: 15 July 1999
Abstract
A completely general parametrization of the time-dependent decay rates
of the modes
and
is given, which are related to each other through the U-spin flavour
symmetry of strong interactions. Owing to the interference of
current-current
and penguin processes, the
observables
probe the angle
of the unitarity triangle. Using the U-spin
symmetry, the overall normalization of the
rate can be fixed with the help of the CP-averaged
rate, providing a new strategy to determine
. This extraction of
is not affected by any final-state-interaction effects, and its
theoretical accuracy is only limited by U-spin-breaking corrections.
As a by-product, this strategy allows us to also take into account the
penguin effects in the determination of
from
,which are presumably very small, and to
predict the direct CP asymmetry arising in this mode. An analogous strategy
is provided by the time-dependent
rate, if its overall
normalization is fixed through the CP-averaged
rate.
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