31. (a) The _- was discovered in the reaction K- +p _ _- +K+ +K0 . In terms of the masses of the various particles, what is the threshold kinetic energy for the reaction to occur if the proton is at rest? (b) Suppose the K0 travels at a speed of 0.8c. It decays in flight into two neutral pions. Find the maximum angle (in the laboratory frame) that the pions can make with the K0 line of flight. Express your answer in terms of the _ and K masses.
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