5 papers · 1 filter
Instability in scalar channel of fermion-antifermion scattering amplitude in massless QED_3 and anomalous dimensions of composite operators
Indrajit Mitra, Raghunath Ratabole, H. S. Sharatchandra
Instability in the scalar channel of the fermion-antifermion scattering amplitude in massless QED_3 for number of flavours less than the critical value 128/3π^2 is demonstrated. Th…
Gauge-invariant dressed fermion propagator in massless QED_3
Indrajit Mitra, Raghunath Ratabole, H. S. Sharatchandra
The infrared behaviour of the gauge-invariant dressed fermion propagator in massless QED_3 is discussed for three choices of dressing. It is found that only the propagator with the…
Gauge dependence of the infrared behaviour of massless QED_3
Indrajit Mitra, Raghunath Ratabole, H. S. Sharatchandra
Using the Zumino identities it is shown that in a class of non-local gauges, massless QED_3 has an infrared behaviour of a conformal field theory with a continuously varying anomal…
Infrared behaviour of massless QED in space-time dimensions 2 < d < 4
Indrajit Mitra, Raghunath Ratabole, H. S. Sharatchandra
We show that the logarithmic infrared divergences in electron self-energy and vertex function of massless QED in 2+1 dimensions can be removed at all orders of 1/N by an appropriat…
Transverse Spin in QCD. I. Canonical Structure
A. Harindranath, Asmita Mukherjee, Raghunath Ratabole
In this work we initiate a systematic investigation of the spin of a composite system in an arbitrary reference frame in QCD. After a brief review of the difficulties one encounter…