Meson-like Baryons and the Spin-Orbit Puzzle

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Meson-like Baryons and the Spin-Orbit Puzzle

I describe a special class of meson-like \Lambda_Q excited states and present evidence supporting the similarity of their spin-independent spectra to those of mesons. I then examine spin-dependent forces in these baryons, showing that predicted effects of spin-orbit forces are small for them for the same reason they are small for the analogous mesons: a fortuitous cancellation between large spin-orbit forces due to one-gluon-exchange and equally large inverted spin-orbit forces due to Thomas precession in the confining potential. In addition to eliminating the baryon spin-orbit puzzle in these states, this solution provides a new perspective on spin-orbit forces in all baryons.

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Unit Title: Meson-like Baryons and the Spin-Orbit Puzzle

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Creator: Isgur, N.

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Language: English

Biography or History: arXiv:hep-ph/9910272

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Other Descriptive Data: DOI: https://doi.org/10.1103/PhysRevD.62.014025

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