Measurement of the branching fraction and Lamda[over-bar] polarization in B0-->Lambda[over-bar]pPi[superscript -]

• Main Authors: Zhao, M. (Contributor), Yamamoto, R. K. (Contributor), Spitznagel, M. (Contributor), Sciolla, Gabriella (Contributor), Henderson, Shawn Wesley (Contributor), Cowan, Ray Franklin (Contributor), Fisher, Peter H. (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), Massachusetts Institute of Technology. Laboratory for Nuclear Science (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society, 2010-05-05T18:33:41Z.
• Subjects: Article
• Online Access: Get fulltext

We present a measurement of the B0-->Lambda[over-bar] pPi[superscript -] branching fraction performed using the BABAR detector at the PEP-II asymmetric e[superscript +]e[superscript -] collider. Based on a sample of 467×10[superscript 6] B[bar-over B] pairs we measure B(B0-->Lambda[over-bar] pPi[superscript -])=[3.07±0.31  (stat)±0.23 (syst)]×10[superscript -6]. The measured differential spectrum as a function of the dibaryon invariant mass m(Lambda[over-bar]p) shows a near-threshold enhancement similar to that observed in other baryonic B decays. We study the Lambda[over-bar] polarization as a function of Lambda[over-bar] energy in the B[superscript 0] rest frame (E[superscript *]Lambda[over-bar]) and compare it with theoretical expectations of fully longitudinally right-polarized Lambda[over-bar] at large E[superscript *]Lambda[over-bar].
Science and Technology Facilities Council, United Kingdom
MEC (Spain)
Ministry of Education and Science of the Russian Federation
Norges forskningsråd
FOM of the Netherlands
Istituto Nazionale di Fisica Nucleare of Italy
Deutsche Forschungsgemeinschaft
Bundesministerium für Bildung und Forschung, Germany
Institut National de Physique Nucleaire et Physique des Particules/CNRS
Commissariat à l'Energie Atomique
Natural Sciences and Engineering Research Council of Canada
National Science Foundation
United States Department of Energy