Observation and study of the baryonic B-meson decays B→D(*)pp¯(π)(π)
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 1.5GeV/c2. The distributions for the five-body modes, in contrast to the others, are similar to the expectations from uniform phase-space predictions.
- Publication:
-
Physical Review D
- Pub Date:
- May 2012
- DOI:
- 10.1103/PhysRevD.85.092017
- arXiv:
- arXiv:1111.4387
- Bibcode:
- 2012PhRvD..85i2017D
- Keywords:
-
- 13.25.Hw;
- 12.39.Mk;
- 14.20.Gk;
- 14.40.Nd;
- Decays of bottom mesons;
- Glueball and nonstandard multi-quark/gluon states;
- Baryon resonances with S=0;
- Bottom mesons;
- High Energy Physics - Experiment
- E-Print:
- 24 pages, 14 postscript figures, submitted to Phys. Rev. D