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

Abstract

This dissertation presents a simultaneous measurement of the branching fractions of ten <i>B</i> &#38;#8594; <i>D</i>⁽*⁾<i>D</i>&#38;#773;⁽*⁾ decays. The measurements are derived from a sample of 2.32 × 10⁸ <i>BB</i>&#38;#773; pairs collected by the BABAR detector at the PEP-&#38;#8545;<i>B</i> Factory located at Stanford Linear Accelerator Center. The branching fractions (×10^&#38;#8722;4) are:

&#38;#8722;0.10 ± 0.47 ± 0.15 (&#60; 0.59) for <i>B</i>⁰ &#38;#8594; <i>D</i>⁰<i>D</i>&#38;#773;⁰<br /> 1.01 ± 1.11 ± 0.35 (&#60; 2.92) for <i>B</i>⁰ &#38;#8594; <i>D</i>*⁰<i>D</i>&#38;#773;⁰<br /> &#38;#8722;1.31 ± 1.10 ± 0.38 (&#60; 0.92) for <i>B</i>⁰ &#38;#8594; <i>D</i>*⁰<i>D</i>&#38;#773;*⁰<br /> 2.81 ± 0.44 ± 0.45 for <i>B</i>⁰ &#38;#8594; <i>D</i>⁺<i>D</i>^&#38;#8722;<br /> 5.72 ± 0.65 ± 0.71 for <i>B</i>⁰ &#38;#8594; <i>D</i>*⁺<i>D</i>^&#38;#8722;<br /> 8.11 ± 0.57 ± 0.98 for <i>B</i>⁰ &#38;#8594; <i>D</i>*⁺<i>D</i>*^&#38;#8722;<br /> 3.76 ± 0.59 ± 0.45 for <i>B</i>^&#38;#8722; &#38;#8594; <i>D</i>^&#38;#8722;<i>D</i>⁰<br /> 3.56 ± 0.54 ± 0.40 for <i>B</i>^&#38;#8722; &#38;#8594; <i>D</i>*^&#38;#8722;<i>D</i>⁰<br /> 6.30 ± 1.35 ± 0.95 for <i>B</i>^&#38;#8722; &#38;#8594; <i>D</i>^&#38;#8722;<i>D</i>*⁰<br /> 8.14 ± 1.20 ± 1.16 for <i>B</i>^&#38;#8722; &#38;#8594; <i>D</i>*^&#38;#8722;<i>D</i>*⁰<br />

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.