Abstract
The electromagnetic mass difference of pions at finite temperature is computed. The finite temperature contribution to δm 2 π ≡ m 2 π + − m 2 π 0 is obtained to be παT 2, neglecting the corrections due to the ϱ and A 1 mesons. It has the same sign as the zero temperature value and is comparable to it in magnitude around T ≈ 200 MeV. The calculation is also done in case of supersymmetric QCD where it is known that at T = 0 δm 2 π = 0. The results may have implications for cosmology and for relativistic heavy ion collisions.
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