Infrared universality in massive theories: Another example

The infrared behavior of the φ3-theory is discussed stressing analogies with the Witten-Seiberg story about N = 2 QCD. Though the microscopic theory is apparently not integrable, the effective theory is shown to be integrable at the classical level, and a general solution of it in terms of hyper-geometric functions is obtained. An effective theory for the multi-particle soft scattering is sketched.