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Measurement of the branching fraction and Λ¯ polarization in B0→Λ¯pπ-

Aubert, B. et al. (2009) Measurement of the branching fraction and Λ¯ polarization in B0→Λ¯pπ-. Physical Review D, 79 (11). p. 112009. ISSN 1550-7998

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Abstract

We present a measurement of the B0→Λ̅ pπ- branching fraction performed using the BABAR detector at the PEP-II asymmetric e+e- collider. Based on a sample of 467×106 BB̅ pairs we measure B(B0→Λ̅ pπ-)=[3.07±0.31 (stat)±0.23 (syst)]×10-6. The measured differential spectrum as a function of the dibaryon invariant mass m(Λ̅ p) shows a near-threshold enhancement similar to that observed in other baryonic B decays. We study the Λ̅ polarization as a function of Λ̅ energy in the B0 rest frame (EΛ̅ *) and compare it with theoretical expectations of fully longitudinally right-polarized Λ̅ at large EΛ̅ *.

Item Type: Article
Subjects: Q Science > QC Physics
Schools: School of Applied Sciences
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Depositing User: Sharon Beastall
Date Deposited: 05 Jan 2012 11:05
Last Modified: 05 Jan 2012 11:05
URI: http://eprints.hud.ac.uk/id/eprint/12349

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