Field Theory of Dual-Resonance Model
Yuji Nakawaki, Takesi Saito · Progress of Theoretical Physics · 1972
By the second-quantization of the string model of hadrons, a field theory of dual resonance model is obtained. The subsidiary conditions are imposed in analogy to the Lorentz condition in quantum electrodynamics. A compatibility of the quantization rule with the subsidiary condition is quite satisfactory. As a result we find a simple Feynman rule, which leads to the dual amplitudes. The iso-spin can be quite easily built in our model.