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Open Access item Measurement of the branching fraction and (Lambda)over-bar polarization in B-0 ->(Lambda)over bar p pi(-)

Authors:Babar Collaboration
Azzolini, Virginia
López-March, Neus
Martínez-Vidal, Fernando
Milanés, Diego A.
Oyanguren, Arantza
Aubert, B.
Issue Date:19-Jun-2009
Publisher:American Physical Society
Citation:Physical Review - Section D - Particles and Fields 79 (11): 112009 (2009)
Abstract:We present a measurement of the B-0 -> (Lambda) over barp pi(-) branching fraction performed using the BABAR detector at the PEP-II asymmetric e(+)e(-) collider. Based on a sample of 467 x 10(6) B (B) over bar pairs we measure B(B-0 -> (Lambda) over barp pi(-)) = [3.07 +/- 0.31(stat) +/- 0.23(syst)] x 10(-6). The measured differential spectrum as a function of the dibaryon invariant mass m((Lambda) over barp) 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-0 rest frame (E-(Lambda) over bar*) and compare it with theoretical expectations of fully longitudinally right-polarized (Lambda) over bar at large E-(Lambda) over bar*.
Publisher version (URL):http://dx.doi.org/ 10.1103/PhysRevD.79.112009
URI:http://hdl.handle.net/10261/22057
ISSN:1550-7998
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