An introduction to the quark model

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Few-charge systems History of the quark model Mesons Baryons Multiquarks and other exotics Outlook Binary atoms-2 Very characteristic spectrum 1 E = − , 4 (n + ℓ) 2 where n = 1, 2, . . . is the radial number, ℓ = 0, 1, . . . the orbital momentum, and n + ℓ the principal quantum number. Degeneracy of orbital vs. radial excitations, Infinite number of bound states, even for very small coupling, In contrast with short-range interactions in nuclear physics, Many probes: hydrogen-like atoms, muonic atoms, kaonic atoms, positronium JMR Quark Model
Few-charge systems History of the quark model Mesons Baryons Multiquarks and other exotics Outlook Spin forces in atoms Deduced from the vector character of the exchanged photon, Automatically included in fully relativistic treatments, Pauli, Fermi, Breit, etc., derived corrections to be added to NR Hamiltonians, and treated as perturbation, In particular, the famous hyperfine correction Vss = e2 m1 m2 2 π 3 δ(3) (r) σ1.σ2 , splits ortho- and para-hydrogen (important transition in astrophysics; analogue to be measured in antihydrogen), Note the short-range character, Note the very specific mass dependence For (e + , e − ), ∃ other contribution JMR Quark Model
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An introduction to the quark model

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