Kapitza dynamics supplies a short-range 1/r^4 repulsion in a modified Cornell potential, stabilizing heavy tetraquarks and reproducing the X(3872) mass while predicting a bound T_bb consistent with lattice results.
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Unquenched quark model calculations show coupled-channel effects lower masses of higher D and Ds excitations; D_s1(2933) is assigned as mixed D_s(2P1), D_sJ(3040) favors D_s(3^1S0), while D(3000) fits none of the 3S/2P/2D/1F states.
Node-induced cancellations in the relativistic decay amplitude suppress the D D-bar width of ψ(4040) while leaving D D* and D_s D_s-bar channels sizable.
A relativistic potential model with few parameters qualitatively reproduces heavy meson masses and radiative widths, remaining finite at zero light quark mass.
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Higher excited charmed and charmed-strange mesons in an unquenched quark model
Unquenched quark model calculations show coupled-channel effects lower masses of higher D and Ds excitations; D_s1(2933) is assigned as mixed D_s(2P1), D_sJ(3040) favors D_s(3^1S0), while D(3000) fits none of the 3S/2P/2D/1F states.