Creating Z_0 boson via symmetric beams a. Z0 boson has a rest mass energy of 91.187 GeV. It is produced in collisions of positrons and electrons.

Question

e^- + e^+ to Z_0
How much kinetic energy must the positrons and electrons in symmetric colliding beams have to produce the Z0 boson? The rest mass energy for electrons and positrons is 0.511 MeV.

Creating Z0 boson via positron beam striking electron target
b. Instead, suppose a beam of positrons strike electrons that are at rest. How much energy must the positrons have to produce the Z0 boson?
c. Compare and comment on your answers to part a and b. Hint: The answers should be very different.