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Instability in the scalar channel of the fermion-antifermion scatteringamplitude in massless QED_3 for number of flavours less than the critical value128/3\pi^2 is demonstrated. The anomalous dimensions of gauge-invariantcomposite operators are determined to O(1/N). Exponentiation of the O(1/N)infrared logarithm is explicitly demonstrated by evaluating the contribution ofthe ladder diagrams.Comment: 10 pages, uses axodraw.sty; minor additions, version to appear in  Mod. Phys. Lett.

INSTABILITY IN SCALAR CHANNEL OF FERMION–ANTIFERMION SCATTERING AMPLITUDE IN MASSLESS QED3 AND ANOMALOUS DIMENSIONS OF COMPOSITE OPERATORS

INSTABILITY IN SCALAR CHANNEL OF FERMION–ANTIFERMION SCATTERING AMPLITUDE IN MASSLESS QED₃ AND ANOMALOUS DIMENSIONS OF COMPOSITE OPERATORS