We present results for B-meson decay modes involving a charm meson, protons, and pions using 455×106 BB̄ 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→D0pp̄, B ̄0→D *0pp̄, B ̄0→D +pp̄π -, B ̄0→D * +pp̄π -, B -→D0pp̄π -, B -→D *0pp̄π -, B ̄0→D0pp̄π -π +, B ̄0→D *0pp̄π -π +, B -→D +pp̄π -π -, and B -→D * +pp̄π -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(pp̄) and M(D(*)0p) invariant-mass distributions show enhancements near threshold values. In the four-body mode B ̄0→D +pp̄π -, 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.
Sanchez, P., Lees, J., Poireau, V., Prencipe, E., Tisserand, V., Tico, J., et al. (2012). Observation and study of the baryonic B-meson decays B→D. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 85(9) [10.1103/PhysRevD.85.092017].
Observation and study of the baryonic B-meson decays B→D
CARPINELLI, MassimoMembro del Collaboration Group
;
2012
Abstract
We present results for B-meson decay modes involving a charm meson, protons, and pions using 455×106 BB̄ 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→D0pp̄, B ̄0→D *0pp̄, B ̄0→D +pp̄π -, B ̄0→D * +pp̄π -, B -→D0pp̄π -, B -→D *0pp̄π -, B ̄0→D0pp̄π -π +, B ̄0→D *0pp̄π -π +, B -→D +pp̄π -π -, and B -→D * +pp̄π -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(pp̄) and M(D(*)0p) invariant-mass distributions show enhancements near threshold values. In the four-body mode B ̄0→D +pp̄π -, 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.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
