Comments on Mesonic Correlators in the Worldline Formalism

Understand

We elaborate on how to incorporate mesonic correlators into the worldline formalism.

• We consider possible applications to QCD-like theories in various dimensions.
• We focus on large-N_c two dimensional QCD (the 't Hooft model) and relate it to a single harmonic oscillator.
• We also discuss the dependence of the Peskin S-parameter on the number of massless flavors and their representation and compare our expression to the corresponding expression obtained at weak coupling.