P. K. MitterP. H. WeiszUniversity of MarylandUniversite Pierre et Marie CurieMahidol University2018-03-222018-03-221973-01-01Physical Review D. Vol.8, No.12 (1973), 4410-4429055628212-s2.0-0000713750https://repository.li.mahidol.ac.th/handle/20.500.14594/10225Renormalized Ward identities and Callan-Symanzik equations are developed for vertex functions involving composite fields in a massive Thirring model with U(n) symmetry. The existence of a critical curve of fixed points of a renormalization group acting on a space of coupling constants is proved. On this curve all nonsoft axial-vector and scaling anomalies vanish. Attraction properties of this curve are investigated. The possibility of a second critical curve for strong coupling is discussed. © 1973 The American Physical Society.Mahidol UniversityPhysics and AstronomyArticleSCOPUS10.1103/PhysRevD.8.4410