Light meson radial Regge trajectories

Details Light meson radial Regge trajectories Light meson radial Regge trajectories

2002-04-08

arxiv.org/abs/hep-ph/0204088v1

Phys.Rev. D66 (2002) 034026

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, 1 figure

Scientific paper

10.1103/PhysRevD.66.034026

A new physical mechanism is suggested to explain the universal depletion of high meson excitations. It takes into account the appearance of holes inside the string world sheet due to $q\bar{q}$ pair creation when the length of the string exceeds the critical value $R_1 \simeq 1.4$ fm. It is argued that a delicate balance between large $N_c$ loop suppression and a favorable gain in the action, produced by holes, creates a new metastable (predecay) stage with a renormalized string tension which now depends on the separation r. This results in smaller values of the slope of the radial Regge trajectories, in good agreement with the analysis of experimental data in [Ref.3]

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