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In the derivation of scattering amplitudes (e.g. page 94 in http://kcl.ac.uk/content/1/c6/06/20/94/LecturesSM2010.pdf [Broken]) does anyone have a clue as to how to prove that the momentum uncertainty element

(\delta p)^3/E

is Lorentz invariant? I know how to do it for the measure d^3p/E, but I am not sure how to proceed for the given (non-infinitesimal) element.

Thank,

P

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# Problem: Prove invariance of momentum factor

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