Meson loops in the NambuJonaLasinio model
Abstract
The effects of meson loops in the vacuum sector of the NambuJonaLasinio model are calculated. Using the effective action formalism we take consistently all nexttoleadingorder {1}/{N _{c}} terms into account. This leads to a symmetryconserving approach, in which all features of spontaneously broken chiral symmetry, such as the Goldstone theorem, the GoldbergerTreiman and the GellMannOakesRenner relations are preserved. Contributions to < overlineqq> and F_{π} are calculated, and are shown to be substantial, at the level of 30%, consistent with the {1}/{N _{c}} expansion. The leading nonanalytic terms in the chiral expansion of < overlineqq> , F_{π} and m_{π} have the same form as the oneloop results of chiral perturbation theory.
 Publication:

Nuclear Physics A
 Pub Date:
 February 1996
 DOI:
 10.1016/03759474(96)00231X
 arXiv:
 arXiv:hepph/9602274
 Bibcode:
 1996NuPhA.608..411N
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 revised version