| Abstract |
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Using 65 million Upsilon(4S) -> BBbar events collected with the
BABAR detector at the PEP-II e+e- storage ring
at the Stanford Linear Accelerator Center,
we measure the color-favored branching fractions
BF(B0 -> D- pi+) = (2.55 \pm 0.05 \pm 0.16)*10^{-3},
BF(B0 -> D*- pi+)= (2.79 \pm 0.08 \pm 0.17)*10^{-3},
BF(B- -> D0 pi-) = (4.90 \pm 0.07 \pm 0.22)*10^{-3} and
BF(B- -> D*0 pi-)= (5.52 \pm 0.17 \pm 0.42)*10^{-3},
where the first error is statistical and the second is systematic.
With these results and the current world average
for the branching fraction for the color-suppressed decay
B0 -> D(*)0 pi0, the cosines of the strong phase
difference delta between the I=1/2 and I=3/2 isospin amplitudes
are determined to be
cos(delta) = 0.872^{+0.008+0.031}_{-0.007-0.029}
for the B -> D pi process and
cos(delta) = 0.924^{+0.019+0.063}_{-0.017-0.054}
for the B -> D* pi process.
Under the isospin symmetry, the results for cos(delta) suggest that
final-state interactions are present in the D pi system.
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