439-1439-1439-1transitions: model-independent bounds on invariant form factors

In this note we report on some model-independent bounds involving the transition form factors for Ω_b → Ω_c and Ω_b → Ω _c ^* transitions and the nonperturbative matrix elements of the Ω_b system. The bounds are derived by using operator product expansion (OPE) methods in heavy quark effective theory.