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Recent application of ultrafast pump/probe optical techniques tosuperconductors has renewed interest in nonequilibrium superconductivity andthe predictions that would be available for novel superconductors, such as thehigh-Tc cuprates. We have reexamined two of the classical models which havebeen used in the past to interpret nonequilibrium experiments with somesuccess: the mu* model of Owen and Scalapino and the T* model of Parker.Predictions depend on pairing symmetry. For instance, the gap suppression dueto excess quasiparticle density n in the mu* model, varies as n^{3/2} in d-waveas opposed to n for s-wave. Finally, we consider these models in the context ofS-I-N tunneling and optical excitation experiments. While we confirm thatrecent pump/probe experiments in YBCO, as presently interpreted, are inconflict with d-wave pairing, we refute the further claim that they agree withs-wave.Comment: 14 pages, 11 figure

Comparison ofs- andd-wave gap symmetry in nonequilibrium superconductivity