Observation and study of the baryonic B-meson decays B→D(*)pp̅ (π)(π)

• Main Authors: Cowan, Ray Franklin (Contributor), Dujmic, Denis (Contributor), Sciolla, Gabriella (Contributor), Zhao, M. (Contributor)
• Other Authors: Massachusetts Institute of Technology. Laboratory for Nuclear Science (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society, 2012-08-15T18:42:28Z.
• Subjects: Article
• Online Access: Get fulltext

 We present results for B-meson decay modes involving a charm meson, protons, and pions using 455×10[superscript 6] BB̅ pairs recorded by the BaBar detector at the SLAC PEP-II asymmetric-energy e[superscript +]e[superscript -] collider. The branching fractions are measured for the following ten decays: B̅ [superscript 0]→D[superscript 0]pp̅ , B̅ [superscript 0]→D[superscript *0]pp̅ , B̅ [superscript 0]→D[superscript +]pp̅ π[superscript -], B̅ [superscript 0]→D*[superscript +]pp̅ π[superscript -], B[superscript -]→D[superscript 0]pp̅ π[superscript -], B[superscript -]→D[superscript *0]pp̅ π[superscript -], B̅ [superscript 0]→D[superscript 0]pp̅ π[superscript -]π[superscript +], B̅ [superscript 0]→D[superscript *0]pp̅ π[superscript -]π[superscript +], B-→D[superscript +]pp̅ π[superscript -]π[superscript -], and B-→D[superscript *+]pp̅ π[superscript -]π[superscript -]. The four B[superscript -] and the two five-body B̅ 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(pp̅ ) and M(D [[superscript (*)0]p) invariant-mass distributions show enhancements near threshold values. In the four-body mode B̅ [superscript 0]→D[superscript +]pp̅ π[superscript -], the M(pπ[superscript -]) distribution shows a narrow structure of unknown origin near 1.5  GeV/c[superscript 2]. The distributions for the five-body modes, in contrast to the others, are similar to the expectations from uniform phase-space predictions.