Prove that they have a cm frame

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Reference no: EM131049890

Two particles a and b with masses ma= 0 and mb> 0 approach one another. Prove that they have a CM frame (that is, a frame in which their total three-momentum is zero). [Hint: As you should explain, this is equivalent to showing that the sum of two four-vectors, one of which is forward light-like and one forward time-like, is itself forward time-like.]

Reference no: EM131049890

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