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QCD sum rules for the determination of form factors of $\Lambda_b$ and$\Lambda_c$ semileptonic decays are investigated. With a form for the baryoniccurrent appropriate for the limits of the heavy quark symmetries, the differenttensor structures occurring in the two- and three-point functions areseparately studied, and in each case general relations are written for the formfactors. Particular attention is given to the treatment of the kinematicalregion ascribed to the continuum. The $t$-dependence of the form factors andthe decay rates are numerically evaluated and compared to experimentalinformation.Comment: 45 pages, 14 figure

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Form factors and decay rates for heavy<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Λ</mml:mi></mml:math>semileptonic decays from QCD sum rules

Form factors and decay rates for heavyΛsemileptonic decays from QCD sum rules