1. The problem statement, all variables and given/known data A Σ0 baryon, travelling with an energy of 2 GeV, decays electromagnetically into a Λ and a photon. What condition results in the Λ carrying the maximum possible energy after the decay? Sketch how the decay appears in this case, and calculate this energy. Explain your reasoning. [Mass of Σ0 is 1.193 GeV/c2; mass of Λ is 1.116 GeV/c2] 2. Relevant equations Relativistic kinematic equations; CoM invariant mass 3. The attempt at a solution So im not sure on the condition for maximum energy of the Λ, is it when the photon is travelling with opposite momenta? because the photon is a mass less particle it couldn't have 0 velocity right?