Search for B̄→Λc+X -ν ̄ decays in events with a fully reconstructed B meson

J. P. Lees,V. Poireau,V. Tisserand,J. Garra Tico,E. Grauges,M. Martinelli,D. A. Milanes,A. Palano,M. Pappagallo,G. Eigen,B. Stugu,L. Sun,D. N. Brown,L. T. Kerth, Yu G. Kolomensky,G. Lynch,T. Tanabe,H. Koch,T. Schroeder,D. J. Asgeirsson,C. Hearty,T. S. Mattison,J. A. McKenna,A. Khan,V. E. Blinov,A. R. Buzykaev,V. P. Druzhinin,V. B. Golubev,E. A. Kravchenko,A. P. Onuchin,S. I. Serednyakov,Yu I. Skovpen,E. P. Solodov,K. Yu Todyshev,A. N. Yushkov,M. Bondioli,D. Kirkby,A. J. Lankford,M. Mandelkern,D. P. Stoker,H. Atmacan,J. W. Gary,F. Liu,O. Long,G. M. Vitug,C. Campagnari,T. M. Hong,D. Kovalskyi,J. D. Richman,C. A. West,A. M. Eisner,J. Kroseberg,W. S. Lockman,A. J. Martinez,T. Schalk,B. A. Schumm,A. Seiden, C. H. Cheng,D. A. Doll,B. Echenard,K. T. Flood,D. G. Hitlin,P. Ongmongkolkul,F. C. Porter,A. Y. Rakitin,R. Andreassen,M. S. Dubrovin,Z. Huard,B. T. Meadows,M. D. Sokoloff,P. C. Bloom,W. T. Ford,A. Gaz,M. Nagel,U. Nauenberg,J. G. Smith,S. R. Wagner,R. Ayad,W. H. Toki,B. Spaan,M. J. Kobel,K. R. Schubert,R. Schwierz,D. Bernard,M. Verderi,P. J. Clark,S. Playfer,D. Bettoni,C. Bozzi,R. Calabrese,G. Cibinetto,E. Fioravanti,I. Garzia

PHYSICAL REVIEW D（2012）

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摘要

We present a search for semileptonic B decays to the charmed baryon Lambda(c)+ based on 420 fb(-1) of data collected at the 4S resonance with the BABAR detector at the PEP-II e(+)e(-) storage rings. By fully reconstructing the recoiling B in a hadronic decay mode, we reduce non-B backgrounds and determine the flavor of the signal B. We statistically correct the flavor for the effect of the B0 mixing. We obtain a 90% confidence level upper limit of Bd ((B) over bar -> Lambda(+)(c) Xl(-) (nu) over bar (l))/B ((B) over bar -> Lambda(+)(c) X) (< 3: 5%.

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