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*.

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

ANDREOTTI, Mirco;CALABRESE, Roberto;CECCHI, Annalisa;CIBINETTO, Gianluigi;FIORAVANTI, Elisa;FRANCHINI, Paolo;LUPPI, Eleonora;MUNERATO, Mauro;NEGRINI, Matteo;PETRELLA, Antonio;SANTORO, Valentina;
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*.
2009
B., Aubert; Y., Karyotakis; J. P., Lees; V., Poireau; E., Prencipe; X., Prudent; V., Tisserand; J. G., Tico; E., Grauges; M., Martinelli; A., Palano; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1377798
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