Interpretation of the Bjorken x.

Question

In the infinite momentum frame the Bjorken x, \(x_B\), is interpreted as the longitudinal momentum fraction  of a nucleon carried by the struck parton. How can \(x_B = \frac{Q^2}{2P.q}\) , where the symbols carry the usual meanings, be interpreted that way? What is the logic behind that interpretation? Could you please explain it in a rather intuitive way?

Comments

Hm I know the infinite momentum frame from some other context, so the symbols used here are unfamiliar to me at least... ?
 

---

Dear Dilation

In a deep-inelastic scattering process, \(Q^2 = -q^2\) and P and q are the four momenta of the nucleon and the virtual photon. Thanks.

---

Thanks, this already helps a bit. But thinking more about it I realize that I have some difficulties in figuring out what is the exact (scattering) process you are looking at? I do best understand things when they are pictured by Feynman diagrams, but I have not yet tried to produce them in LaTex, not sure if it would work here ...

---

Dear Dilation

The Feynman diagram will be the simplest in case of inclusive deep inelastic scattering: an electron scatters from a nucleon and only the electron is detected in the final state; for a deep inelastic process \(Q^2 > 1 \mathrm{GeV^2}\). Thanks