Observation and study of the baryonicB-meson decaysB→D(*)pp¯(π)(π)
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Abstract
We present results for B-meson decay modes involving a charm meson, protons, and pions using 455×106 BB⎯⎯⎯ pairs recorded by the BaBar detector at the SLAC PEP-II asymmetric-energy e+e− collider. The branching fractions are measured for the following ten decays: B⎯⎯⎯0→D0pp⎯⎯, B⎯⎯⎯0→D*0pp⎯⎯, B⎯⎯⎯0→D+pp⎯⎯π−, B⎯⎯⎯0→D*+pp⎯⎯π−, B−→D0pp⎯⎯π−, B−→D*0pp⎯⎯π−, B⎯⎯⎯0→D0pp⎯⎯π−π+, B⎯⎯⎯0→D*0pp⎯⎯π−π+, B−→D+pp⎯⎯π−π−, and B−→D*+pp⎯⎯π−π−. The four B− and the two five-body B⎯⎯⎯0 modes are observed for the first time. The four-body modes are enhanced compared to the three- and the five-body modes. In the three-body modes, the M(pp⎯⎯) and M(D(*)0p) invariant-mass distributions show enhancements near threshold values. In the four-body mode B⎯⎯⎯0→D+pp⎯⎯π−, the M(pπ−) distribution shows a narrow structure of unknown origin near 1.5 GeV/c2. The distributions for the five-body modes, in contrast to the others, are similar to the expectations from uniform phase-space predictions.
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