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Answer to Question #37093 in Field Theory for maryam

Question #37093
I've calculated the "scattering amplitude" for box diagram in scattering of quark-quark.
In my result there is an infrared divergence due to gluon mass, and I want to know whether there is any way I can get rid of this divergency.
And I emphasize that I want to eliminate this divergence in scattering "amplitude" not cross section.
Thanks for your help
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