1/N_c and 1/n preasymptotic corrections to Current-Current correlators

Abstract

We obtain the corrections in $1/n$ and in $1/\ln n$ ($n$ is the principal quantum number of the bound state) of the decay constants of scalar and pseudoscalar currents in two and four dimensions in the large $N_c$. We obtain them from the operator product expansion provided a model for the large $n$ mass spectrum is given. In the two-dimensional case the spectrum is known and the corrections obtained in this paper are model independent. We confirm these results by confronting them with the numerical solution of the 't Hooft model. We also consider a model at finite $N_c$ and obtain the associated decay constants that are consistent with perturbation theory. This example shows that that the inclusion of perturbative corrections, or finite $N_c$ effects, to the OPE does not constrain the slope of the Regge trajectories, which remain a free parameter for each different channel.

29 pages, 11 figures. Two references added

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Cited by in corpus (6)

• An AdS/QCD model from tachyon condensation: II
• Massive holographic QCD in the Veneziano limit
• Glueball and meson propagators of any spin in large-N QCD
• Deep inelastic scattering and factorization in the 't Hooft Model
• Quark-hadron duality for heavy meson mixings in the 't Hooft model
• Breakdown of the operator product expansion in the 't Hooft model