Exam revision corrections

Question 1

[h,H]=0 :
-helicity is conserved ___
-___ of H are ___ of h
-helicity does not change ___ for given frame

Answer 1

quantum number/eigenstates/over time

Question 2

helicity operator lorentz invariant for massless particles:
massless particles move with ___, same in ___ frames, impossible to ___ massless particles

Answer 2

speed of light/all/overtake

Question 3

form factor is a measure of the ___ of the ___ of the ___

Answer 3

shape/charge distribution/target

Question 4

constant form factor for ___ as it corresponds to ___ charge distributions

Answer 4

elementary particles/ point-like

Question 5

any charge distribution looks like a ___ if probed from a ___ distance as low energies correspond to ___ wavelength that cannot resolve structure of target

Answer 5

point-charge/large/long