Pion electromagnetic form factor in the Kroll-Lee-Zumino model at zero and finite temperature

The renormalizable Abelian quantum field theory model of Kroll, Lee and Zumino is used to calculate next-to-leading order corrections to the pion electromagnetic form factor in vector meson dominance. At zero temperature the predictions for both the form factor and electromagnetic radius are found to improve greatly over the tree level result, and are in good agreement with the experimental data. A calculation of the vertex and self energy functions in the Matsubara formalism at finite temperature do not agree with the results of the Gale & Kapusta calculations. The resulting prediction for the radius is found to increase with temperature, consistent \vith ideas about haclronic deconfinernent. Un ive rsi ty of Ca pe To wn The financial assistance of the l'Jational Pd~~search Foundatioll (NFl-F) tov"rarcls this research is hereby acknowledged. Opinions expressed and conclusions arrived at, are those of the author and are not necessarily to be attributed to the NRF. Un ive rsi ty of Ca pe To wn