24,430 research outputs found
Mass singularity and confinement
Infrared behaviour of the fermion propagator is examined by spectral
representation.Assuming asymptotic states and using LSZ reduction formula we
evaluate the the lowest order spectral function by definition.After
exponentiation of it we derive the non perturbative propagator.It shows
confinement and dynamical mass generation explicitly.Comment: 7pages,latex,prepared for light-cone 2005,typos corrected,add
reference
Phase structure of Topologically massive gauge theory with fermion
Using Bloch-Nordsieck approximation fermion propagator in 3-dimensional gauge
theory with topological mass is studied. Infrared divergence of Chern-Simon
term is soft,which modifies anomalous dimension. In unquenched QCD with
2-component spinor anomalous dimension has fractional value,where order
parmeter is divergent.Comment: 3 pages,Latex,no figures,for the proceedings of strong coupling gauge
theory.typos corrected. anomalous dimension is corrected
- …