Homework 2

1) Compare once more the duration of the $\gamma^* p$ interaction with the duration of the partonic interactions inside the proton (as the inverse of the energy fluctuation), in the IMF.

(a) What is the role of the IMF?

(b) What is the role of time dilation?

(c) What is the role of the kinematical variables: $x$, $\nu$ and Q^2 ?

(d) At this stage, can one figure out any role of space contraction?

2) By transforming the differential into a four-dimensional one, show the validity of: 3)