Heavy Quark Symmetry in Nonleptonic B-Decays to Excited Charmed Mesons

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We show in a model independent way the equality of the branching fractions and strong phases for B-> D₁M and B-> D₂*M at leading order in Lambda QCD/Q and alphaₛ(Q) where Q=mb,mc,Eₘ and M is a light meson. These results apply in the color allowed and color suppressed channels and follow from a factorization theorem in SCET combined with heavy quark symmetry. The expected heavy quark symmetry suppression of leading order contributions in the color allowed sector based on analysis of semileptonic decays, is shown to disappear at maximum recoil. Subleading corrections are suppressed by at least one power of LambdaQCD/Q and this is explicitly verified for subleading semileptonic form factors at maximum recoil.