Holstein, BR2024-04-262024-04-262006-01https://hdl.handle.net/20.500.14394/40861This is the pre-published version which is collected from arXiv. The published version is at http://prd.aps.org/abstract/PRD/v74/i8/e085002The factorization property of graviton scattering amplitudes is reviewed and shown to be valid only if the natural value of the gyromagnetic ratio gS=2 is employed—independent of spin.Physical Sciences and Mathematicsarticle