THE AXIAL ANOMALY IN QCD AT FINITE-TEMPERATURE

We study flavor mixing and the U(1)(A) anomaly in QCD at zero and fini te temperature. Using the instanton liquid model, we show that the str ength of the anomaly is essentially unchanged near the critical temper ature for chiral symmetry restoration. We demonstrate that nevertheles s chiral symmetry restoration has important consequences for the eta a nd eta'. In particular, the strange and non-strange components of the eta unmix near T-c. The anomaly does not affect the strange eta, so we expect a light purely strange pseudoscalar near the phase transition.