Comment on "lattice determination of Σ- Λ mixing"

A recent lattice QCD (LQCD) calculation of Σ-Λ mixing by the QCDSF-UKQCD Collaboration [Phys. Rev. D 91, 074512 (2015)] finds a mixing angle about half of that found from the Dalitz-Von Hippel (DvH) flavor SU(3) mass formula which relates the Σ-Λ mixing matrix element to known octet baryon mass differences and which has been used widely to evaluate charge symmetry breaking effects in Λ hypernuclei. We show that the LQCD-calculated Σ-Λ mixing matrix element and octet baryon masses satisfy the DvH mass formula, concluding thereby that a good LQCD evaluation of Σ-Λ mixing requires an equally good reproduction of octet baryon mass differences which is yet to be demonstrated.