Crossing versus noncrossing quark-line diagrams inp¯p→twomesons

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Abstract
Diagrams for p¯p→two mesons (a) without and (b) with quark lines crossing each other are compared. Theoretical arguments favor noncrossing diagrams (type a). Data on p¯p→two pseudoscalars mesons agree (disagree) with dominance of diagrams of the type a (type b). The predictions of the two models for p¯p→ωω differ strongly.

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