Loinaz, WilliamTakeuchi, Tatsu2016-10-182016-10-181999-07-010556-2821http://hdl.handle.net/10919/73268We use the LEP/SLD data to place constraints on Topcolor Assisted Technicolor Models. We find that due to a large negative shift in R_b induced by charged top-pion exchange, it is difficult to make the models compatible with experiment.8 pagesapplication/pdfenIn CopyrightAstronomy & AstrophysicsPhysics, Particles & FieldsPhysicsFERMION PAIR PRODUCTIONSYMMETRY-BREAKINGQED CORRECTIONSTOPCOLORQUARKArticle - Refereedhttps://doi.org/10.1103/PhysRevD.60.015005601