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Mixing Xi - Xi ' Effects and Static Properties of Heavy Xi's

It is shown the importance of mixing of heavy baryons Xi - Xi' with the new quantum numbers for analysis of its characteristics. The quark model of Ono is used as an example. Masses of new baryons as well as mixing angles of the states Xi - Xi' are obtained. The same reasoning is shown to be valid for the interpolating currents of these baryons in the framework of the QCD sum rules.