We argue that the large-(Formula presented) expansion of QCD can be used to treat a Lagrangian of resonances in a perturbative way. As an illustration of this we compute the (Formula presented) coupling of the chiral Lagrangian by integrating out resonance fields at one loop. Given a Lagrangian and a renormalization scheme, this is how in principle one can answer in a concrete and unambiguous manner questions such as at what scale resonance saturation takes place. © 2002 The American Physical Society.
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|Publication status||Published - 1 Jan 2002|