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## Main Question or Discussion Point

Hi

I'm referring to the book Quarks and Leptons (Halzen, Martin). On pages 79-82 nonrelativistic perturbation theory is investigated (i.e. by using the Schroedinger equation, which is first order in time). On Page 85, however, the transition amplitude (T_fi) is used that has been derived on pages 79-82. However, in this chapter (chapter 4) the Klein-Gordon equation is investigated (which is relativistic as well as second order in time).

How can this be right?

thx

I'm referring to the book Quarks and Leptons (Halzen, Martin). On pages 79-82 nonrelativistic perturbation theory is investigated (i.e. by using the Schroedinger equation, which is first order in time). On Page 85, however, the transition amplitude (T_fi) is used that has been derived on pages 79-82. However, in this chapter (chapter 4) the Klein-Gordon equation is investigated (which is relativistic as well as second order in time).

How can this be right?

thx