Using a quark model calibrated in the spacelike region plus analyticity relations, the paper predicts timelike hyperon form factors that agree broadly with available data, with clear exceptions for Lambda and Xi-zero, and finds that the perturbative QCD falloff begins above 30 to 50 GeV squared.
50 [48, 65] (which has a significant errorbar)
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Hyperon electromagnetic timelike elastic form factors at large $q^2$
Using a quark model calibrated in the spacelike region plus analyticity relations, the paper predicts timelike hyperon form factors that agree broadly with available data, with clear exceptions for Lambda and Xi-zero, and finds that the perturbative QCD falloff begins above 30 to 50 GeV squared.