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

((1) Physics department; 2); (2) Institute of Theoretical Physics; (3) Physics Department; Academia Sinica; National Taiwan University); Peking Uinversity; Shi-Lin Zhu(1; W.-Y.P.Hwang(3); Ze-sen Yang(1)

arxiv: hep-ph/9802321 · v1 · submitted 1998-02-14 · ✦ hep-ph

The possible Sigma⁰-Λ mixing in QCD sum rules

Shi-Lin Zhu(1 , 2) , W.-Y.P.Hwang(3) , Ze-sen Yang(1) , ((1) Physics department , Peking Uinversity , (2) Institute of Theoretical Physics , Academia Sinica

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(3) Physics Department National Taiwan University)

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keywords sigmalambdamixingthetacalculateelectromagneticincludedinteraction

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

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The possible Sigma⁰-Λ mixing in QCD sum rules

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