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Present status of the Cabibbo-Radicati sum rule
Phys. Rev. D 13, 616 – Published 1 February, 1976
DOI: https://doi.org/10.1103/PhysRevD.13.616
Abstract
We have reevaluated the Cabibbo-Radicati sum rule using recent data and analyses of pion photoproduction in the resonance region. As an alternate method we have applied the extended vector-dominance model together with the quark model and the latest pion-nucleon total cross sections. Both procedures consistently indicate a breakdown of the sum rule; the disagreements are 14% and 12%, respectively.
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Omitted endnote