1. The problem statement, all variables and given/known data Consider the particle decay: A0 → p + (pi)− (a) In the rest frame of the A0 particle, calculate the momentum of the p and of the (pi)− (express the answer in MeV/c). (b) In the rest frame of the A0 the p and (pi)− emerge back to back. Suppose now that the A0 is not at rest but is travelling such that it has a total energy of 2000 MeV as observed by a stationary observer. If a large number of A0 decays was observed, calculate the minimum and maximum proton momentum that this observer would expect to see in his/her frame of reference. 2. Relevant equations Particle Masses (MeV/c2): (Not sure what its called) A0 = 1116 (pi minus) pi− = 140 (proton) p = 938 (K minus) K− = 494 this may be of use: E^2 = p^2*c^2 + m^2*c^4 3. The attempt at a solution for part a) i put into the above equation E=1116 MeV/c^2(mass of parent particle) and m^2*c^4 = 140 + 938 MeV/c^2. Rearranged equation so its in terms of p and the ceclulated that. Im not 100% on this though so any help would be good. Part b) not very sure at all, i dont really understand the question to be honest. sorry the quesiton might be hard to understand, only my first post. thanks for any help!