The Ξ_Q - Ξ_Q' Mixing and Heavy Baryon Masses

We examine the $Ξ_Q - Ξ'_Q$ mixing and heavy baryon masses in the heavy quark effective theory with the $\mq$ corrections. In the conventional baryon assignment, we obtain the mixing angle $\cos^2 θ= 0.87\pm 0.03$ in virtue of the Gell-Mann-Okubo mass relation. On the other hand, if we adopt the new baryon assignment given by Falk, the allowed region of the $Σ_c$ mass is upper from 2372 MeV.

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