Abstract
The chapter describes particle interaction and cross section. The derivation of a cross section from nonrelativistic perturbation theory is presented in the chapter. It is postulated that there was an infinite sea of negative energy state that was all filled up so that positive energy particles would not collapse into it. The answer to this problem is to let the positive energy solutions be particles and the negative energy solutions be antiparticles. It is found that a negative energy electron moves backward in time to the vertex where it scatters with a virtual photon and then propagates forward in time. In the case of a secondary beam, produced by proton acting on an intermediate target, the actual particle that interacts may not be completely clear because the secondary beam is an admixture of several particles. The relationship between the total cross section and the imaginary part of the forward scattering amplitude is known as the optical theorem. The quark model, hadron–hadron interactions, and parton distribution functions are also elaborated in the chapter.
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