By Stetz A.W.
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Example text
These are called internal lines. • Label all lines with their momentum. External lines carry the momentum that is observed in the lab; in the previous example, k1 , k2 , p1 , and p2 . Label the internal lines as you wish, perhaps q1 , q2 , q3 · · · would be a good choice. Put an arrow on each of the internal lines indicating the flow of momentum. The direction you choose will be arbitrary, but you must make a choice. e. the total momentum flowing in (according to the arrows you have just assigned) equals the total momentum flowing out.
59) to eliminate a†in and a†out . The first term in the last line vanishes unless the initial and final states are identical. This is the unscattered wave, which we will neglect for the time being. 54) to replace the in and out fields with the complete interacting field. ) The limits have a nasty noncovariant look about them. I will clean up the expression with a series of elegant mathematical tricks. 7. THE LSZ REDUCTION SCHEME 55 The sense of the right arrow is that the subsequent expression is obtained by integrating by parts twice and discarding the surface terms.
106) In a timeordered product the timedependent operators are ordered so that later times stand to the left of earlier times. Timeordered products read like Hebrew, right to left. There are several ways of interpreting D(x − y). e. 107) From a physical point of view, it is the probability amplitude for a particle to propagate from y to x. 108) Each kind of particle has its own propagator, but the +i term in the denominator is ubiquitous. The stands for an infinitesimal positive quantity. It’s job is to get the boundary conditions right as you will see in the derivation.