Meson-like Baryons and the Spin-Orbit Puzzle

Details Meson-like Baryons and the Spin-Orbit Puzzle Meson-like Baryons and the Spin-Orbit Puzzle

1999-10-07

arxiv.org/abs/hep-ph/9910272v1

Phys.Rev. D62 (2000) 014025

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages, 4 figures

Scientific paper

10.1103/PhysRevD.62.014025

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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