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

B. Aubert,Y. Karyotakis,J. Lees,V. Poireau,E. Prencipe, X. Prudent,V. Tisserand,J. Garra Tico,E. Grauges,M. Martinelli,A. Palano,M. Pappagallo,G. Eigen,B. Stugu,L. Sun,M. Battaglia, D. Brown,L. Kerth,Yu. Kolomensky,G. Lynch, I. Osipenkov,K. Tackmann,T. Tanabe,C. Hawkes,N. Soni,A. Watson,H. Koch,T. Schroeder,D. Asgeirsson,B. Fulsom, C. Hearty,T. Mattison,J. McKenna,M. Barrett,A. Khan,A. Randle-Conde,V. Blinov,A. Bukin,A. Buzykaev,V. Druzhinin,V. Golubev,A. Onuchin,S. Serednyakov,Yu. Skovpen,E. Solodov,K. Todyshev,M. Bondioli,S. Curry,I. Eschrich,D. Kirkby,A. Lankford,P. Lund,M. Mandelkern,E. Martin,J. Schultz,D. Stoker,H. Atmacan,J. Gary,F. Liu,O. Long,G. Vitug,Z. Yasin, L. Zhang,V. Sharma,C. Campagnari,T. Hong, D. Kovalskyi,M. Mazur,J. Richman,T. Beck,A. Eisner,C. Heusch,J. Kroseberg,W. Lockman,A. Martinez,T. Schalk,B. Schumm,A. Seiden,L. Wang, L. Winstrom, C. Cheng,D. Doll,B. Echenard,F. Fang,D. Hitlin,I. Narsky,T. Piatenko,F. Porter,R. Andreassen, G. Mancinelli,B. Meadows,K. 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PHYSICAL REVIEW D（2009）

Cited 40|Views287

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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*.

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