A parton shower can exponentiate the virtual-graph phase operator within small color subspaces, but in the rapidity-gap test the exponentiated effect is negligible.
There is an approximation, the LC+ approximation, that generalizes the leading color approximation [ 1]
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Exponentiating virtual imaginary contributions in a parton shower
A parton shower can exponentiate the virtual-graph phase operator within small color subspaces, but in the rapidity-gap test the exponentiated effect is negligible.