A potential model built from the Curci-Ferrari massive-gluon action fits charm and bottom meson spectra, and the fit prefers a nonzero gluon mass.
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Nonrelativistic meson masses from the Curci-Ferrari model
A potential model built from the Curci-Ferrari massive-gluon action fits charm and bottom meson spectra, and the fit prefers a nonzero gluon mass.