Determination of the mass of the LambdaLambda dibaryon by the method of QCD sum rules
S. A. Larin, V. A. Matveev, A. A. Ovchinnikov, A. A. Pivovarov
Abstract
The method of QCD sum rules is used to calculate the mass of a hypothetical stable dihyperon H with the quantum numbers of two Lambda hyperons, whose existence was predicted by R.L. Jaffe [Phys. Rev. Lett. 31, 195, 617(E) (1977)] in the framework of the MIT quark-bag model. Within the accuracy of the method of QCD sum rules, which in the present case is 20%, the results obtained here agree with those of Jaffe. However, the method of sum rules does not make it possible to determine whether the mass of the dihyperon H lies above or below the Lambda Lambda threshold (i.e., whether H is stable).
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