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Talk:Threshold energy

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There's an easier way to derive this. Using Lorentz invariance of the square of the total four-momentum along with conservation of momentum, we have . Plugging in the threshold values for the final 4-momentum in the CM frame (rest mass energies, zero total momentum), and the energy equation , the momentum terms cancel and we are left with the equation for . --Babomancer (talk) 02:10, 12 December 2014 (UTC)[reply]