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Título : Measurement of the branching fraction and (Lambda)over-bar polarization in B-0 ->(Lambda)over bar p pi(-)
Autor : Babar Collaboration, Azzolini, Virginia, López-March, Neus, Martínez-Vidal, Fernando, Milanés, Diego A., Oyanguren, Arantza, Aubert, B.
Fecha de publicación : 19-Jun-2009
Editor: American Physical Society
Citación : Physical Review - Section D - Particles and Fields 79 (11): 112009 (2009)
Resumen: 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*.
Versión del editor: 10.1103/PhysRevD.79.112009
ISSN: 1550-7998
DOI: 10.1103/PhysRevD.79.112009
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