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Oliver","submitted_at":"2008-08-21T19:34:52Z","abstract_excerpt":"In the heavy quark limit of QCD, using the Operator Product Expansion, the formalism of Falk for hadrons or arbitrary spin, and the non-forward amplitude, as proposed by Uraltsev, we formulate sum rules involving the Isgur-Wise function $\\xi_{\\Lambda} (w)$ of the baryon transition $\\Lambda_b \\to \\Lambda_c \\ell \\overline{\\nu}_{\\ell}$, where the light cloud has $j^P=0^+$ for both initial and final baryons. 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