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Pion couplings of the Delta(1232)

We calculate the strong couplings of pions to the Delta(1232) resonance using a QCD parameterization method that includes in addition to the usual one-quark also two-quark and previously uncalculated three-quark operators. We find that three-quark operators are necessary to obtain results consistent with the data and other QCD based baryon structure models. Our results are also in quantitative agreement with a model employing large D state admixtures to the nucleon and Delta wave functions indicating that the pion-nucleon and pion-Delta couplings are sensitive to the spatial shape of these baryons.

preprint2013arXivOpen access
Alfons J. BuchmannSteven A. Moszkowski
hep-phnucl-th
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Alfons J. BuchmannSteven A. Moszkowski

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