A Simultaneous Measurement of the Branching Fractions of Ten B to Double Charm Decays

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2006-06-28

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Abstract

This dissertation presents a simultaneous measurement of the branching fractions of ten B → D()D̅() decays. The measurements are derived from a sample of 2.32 × 108 BB̅ pairs collected by the BABAR detector at the PEP-ⅡB Factory located at Stanford Linear Accelerator Center. The branching fractions (×10−4) are:

&#8722;0.10 ± 0.47 ± 0.15 (< 0.59) for B0 &#8594; D0D&#773;0
     1.01 ± 1.11 ± 0.35 (< 2.92) for B0 &#8594; D0D&#773;0
     &#8722;1.31 ± 1.10 ± 0.38 (< 0.92) for B0 &#8594; D
0D&#773;0
     2.81 ± 0.44 ± 0.45 for B0 &#8594; D+D&#8722;
     5.72 ± 0.65 ± 0.71 for B0 &#8594; D
+D&#8722;
     8.11 ± 0.57 ± 0.98 for B0 &#8594; D+D&#8722;
     3.76 ± 0.59 ± 0.45 for B&#8722; &#8594; D&#8722;D0
     3.56 ± 0.54 ± 0.40 for B&#8722; &#8594; D&#8722;D0
     6.30 ± 1.35 ± 0.95 for B&#8722; &#8594; D&#8722;D
0
     8.14 ± 1.20 ± 1.16 for B&#8722; &#8594; D&#8722;D0

The first uncertainty is statistical while the second is systematic. The number in parentheses is the 90% upper limit using the Feldman-Cousins method with systematic uncertainties taken into account. These measurements are consistent with the Standard Model predictions using the factorization assumption.

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