The possible ${\Sigma }^0$-$\Lambda$ mixing in QCD sum rules

Abstract

We calculate the on-shell ${\Sigma }^0$-$\Lambda$ mixing parameter $\theta$ with the method of QCD sum rule. Our result is $\theta (m_{{\Sigma }^0}^2)=(-)(0.5\pm 0.1)$MeV. The electromagnetic interaction is not included.

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