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Observation and study of the baryonic B-meson decays B to D(*) p pbar (pi) (pi)


BABAR Collaboration; Snoek, H (2012). Observation and study of the baryonic B-meson decays B to D(*) p pbar (pi) (pi). Physical Review D (Particles, Fields, Gravitation and Cosmology), 85(9):092017.

Abstract

We present results for B-meson decay modes involving a charm meson, protons, and pions using 455×106 BB̅ 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: B̅ 0→D0pp̅ , B̅ 0→D*0pp̅ , B̅ 0→D+pp̅ π-, B̅ 0→D*+pp̅ π-, B-→D0pp̅ π-, B-→D*0pp̅ π-, B̅ 0→D0pp̅ π-π+, B̅ 0→D*0pp̅ π-π+, B-→D+pp̅ π-π-, and B-→D*+pp̅ π-π-. The four B- 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(*)0p) invariant-mass distributions show enhancements near threshold values. In the four-body mode B̅ 0→D+pp̅ 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.

Abstract

We present results for B-meson decay modes involving a charm meson, protons, and pions using 455×106 BB̅ 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: B̅ 0→D0pp̅ , B̅ 0→D*0pp̅ , B̅ 0→D+pp̅ π-, B̅ 0→D*+pp̅ π-, B-→D0pp̅ π-, B-→D*0pp̅ π-, B̅ 0→D0pp̅ π-π+, B̅ 0→D*0pp̅ π-π+, B-→D+pp̅ π-π-, and B-→D*+pp̅ π-π-. The four B- 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(*)0p) invariant-mass distributions show enhancements near threshold values. In the four-body mode B̅ 0→D+pp̅ 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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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2012
Deposited On:05 Mar 2013 09:34
Last Modified:05 Apr 2016 16:36
Publisher:American Physical Society
ISSN:1550-2368
Publisher DOI:https://doi.org/10.1103/PhysRevD.85.092017

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