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

Author(s)
Zhao, M.; Yamamoto, R. K.; Sciolla, Gabriella; Henderson, Shawn Wesley; Spitznagel, Michael A; Cowan, Ray F; Fisher, Peter H; ... Show more Show less
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Alternative title
Measurement of the branching fraction and Λ̅ polarization in B0→Λ̅ pπ-
Terms of use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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Abstract
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].
Date issued
2009-06
URI
http://hdl.handle.net/1721.1/54718
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review D
Publisher
American Physical Society
Citation
BABAR Collaboration et al. “Measurement of the branching fraction and Lambda[over-bar] polarization in B-->Lambda[over-bar]p pi[superscript -].” Physical Review D 79.11 (2009): 112009. © American Physical Society.
Version: Final published version
ISSN
1550-7998

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