Reference-vector independence fixes the contact term in the tree-level electromagnetic Compton amplitude for arbitrary-spin massive bosons, yielding a manifestly gauge-invariant spinor-helicity expression without spurious poles.
Massive spinor helicity formalism using Mathematica,
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Compton amplitude and Contact term(s) in the Spinor Helicity formalism
Reference-vector independence fixes the contact term in the tree-level electromagnetic Compton amplitude for arbitrary-spin massive bosons, yielding a manifestly gauge-invariant spinor-helicity expression without spurious poles.