We examine the ΞQ − Ξ′Q mixing and heavy baryon masses in the heavy quark effective theory with 1/mQ corrections. In the conventional baryon assignment, we obtain the mixing angle cos2 θ = 0.88 ± 0.12 by 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 Σc mass is greater than 2372 MeV.
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Ito et al. (1996) studied this question.
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