Search for B̄→Λ_c⁺Xℓ⁻ν̅_ℓ decays in Events with a Fully Reconstructed B Meson

Lees, J. P.Poireau, V.Tisserand, V.Garra Tico, J.Grauges, E.Martinelli, M.Milanes, D. A.Izen, Joseph M.Lou, XinchouBaBar Collaboration2014-02-262014-02-262012-01-122012-01-121550-7998http://hdl.handle.net/10735.1/3083We present a search for semileptonic B decays to the charmed baryon Λc+ based on 420fb -1 of data collected at the Υ(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 B(B̄→Λc+X -ν ̄)/B(B̄→Λc+X)<3.5%. © 2012 American Physical Society.en-US© 2012, American Physical SocietyLeptons (Nuclear physics)--DecayB mesons--DecaySearch for B̄→Λ_c⁺Xℓ⁻ν̅_ℓ decays in Events with a Fully Reconstructed B MesonTextLees, J. P., V. Poireau, V. Tisserand, J. Garra Tico, et al. 2012. "Search for B̄→Λ_c⁺Xℓ⁻ν̅_ℓ decays in events with a fully reconstructed B meson." Physical Review D - Particles, Fields, Gravitation and Cosmology 85(1), doi:10.1103/PhysRevD.85.011102851