Abstract
An improved QCD-inspired quark potential is introduced and employed to calculate baryon spectra. This potential has some novel features: (i) the one-gluon exchange potential in it is derived from the exact three-dimensional relativistic equation and contains a retardation term which is logarithmic; (ii) the confining part of the potential is generated from a linear potential Bethe-Salpeter (BS) kernel and a general Lorentz structure of the confinement and includes therefore various spin-dependent terms added to the linear potential; (iii) the off-shell correction part of the potential which is related to the negative energy component of the BS amplitude automatically gives rise to a harmonic oscillator term. We analyse the contributions of all parts of the potential to the baryon spectrum and find that the potential we use makes some improvements to theoretical baryon masses, especially for the Roper resonance.
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