| Abstract |
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We present measurements of the branching fractions and charge asymmetries of B
decays to all D(*)D(*) modes. Using 232 million BBbar pairs recorded on the
Upsilon(4S) resonance by the BaBar detector at the e+e- asymmetric B factory
PEP-II at the Stanford Linear Accelerator Center, we measure the branching
fractions
BF(B0 -> D*+D*-) = (8.1 +- 0.6 +- 1.0) x 10^-4,
BF(B0 -> D*+-D-+) = (5.7 +- 0.7 +- 0.7) x 10^-4,
BF(B0 -> D+D-) = (2.8 +- 0.4 +- 0.5) x 10^-4,
BF(B+ -> D*+D*0) = (8.1 +- 1.2 +- 1.2) x 10^-4,
BF(B+ -> D*+D0) = (3.6 +- 0.5 +- 0.4) x 10^-4,
BF(B+ -> D+D*0) = (6.3 +- 1.4 +- 1.0) x 10^-4,
and BF(B+ -> D+D0) = (3.8 +- 0.6 +- 0.5) x 10^-4,
where in each case the first uncertainty is statistical and the second systematic.
We also determine the limits
BF(B0 -> D*0D*0) < 0.9 x 10^-4,
BF(B0 -> D*0D0) < 2.9 x 10^-4,
and BF(B0 -> D0D0) < 0.6 x 10^-4,
each at 90% confidence level. All decays above denote either member of a charge
conjugate pair. We also determine the CP-violating charge asymmetries
A(B0 -> D*+-D-+) = 0.03 +- 0.10 +- 0.02,
A(B+ -> D*+D*0) = -0.15 +- 0.11 +- 0.02,
A(B+ -> D*+D0) = -0.06 +- 0.13 +- 0.02,
A(B+ -> D*+D*0) = 0.13 +- 0.18 +- 0.04,
and A(B+ -> D+D0) = -0.13 +- 0.14 +- 0.02.
Additionally, when we combine these results with information from time-dependent
CP asymmetries in B0 -> D*+D*- decays and world-averaged branching fractions of
B decays to Ds(*)D(*) modes, we find the CKM phase gamma is favored to lie in
the range [0.07-2.77] radians (with a +0 or +pi radians ambiguity) at 68%
confidence level.
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