Dual resonance model
String theory 

Fundamental objects 
Perturbative theory 
Nonperturbative results 
Phenomenology 
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Theorists

In theoretical physics, a dual resonance model arose during the early investigation (1968–1974) of string theory as an Smatrix theory of the strong interaction.
It was based upon the observation that the amplitudes for the schannel scatterings matched exactly with the amplitudes for the tchannel scatterings among mesons and also the Regge trajectory. It began with the Euler beta function model of Gabriele Veneziano in 1968 for a 4particle amplitude which has the property that it is explicitly st crossing symmetric, exhibits duality between the description in terms of Regge poles or of resonances, and provides a closedform solution to nonlinear finiteenergy sum rules relating s and t channels.
The Veneziano formula was quickly generalized to an equally consistent Nparticle amplitude for which, in chronological order Yoichiro Nambu (1968), Holger Bech Nielsen (1969), and Leonard Susskind (1969), provided a physical interpretation in terms of an infinite number of simple harmonic oscillators describing the motion of an extended onedimensional string, hence came the name "string theory."
The study of dual resonance models was very popular from 1968 to 1974. It was even taught briefly as a graduate level course at MIT, by Fubini and Veneziano, who coauthored an early article.^{[1]} It fell rapidly out of favor around 1974 mainly because it was superseded by quantum chromodynamics as the accepted theory of strong interactions.
See also
Further reading
 Paul H. Frampton (1974). Dual Resonance Models. Frontiers in Physics. ISBN 0805325816.
References
 ↑ S. Fubini and G Veneziano, Level Structure of Dual Resonance Models, Il Nuovo Cimento 64A (1969) 811.