The paper constructs a locally finite two-loop amplitude integrand for photoproduction in quark annihilation, using momentum-flow symmetrization and an antisymmetric counterterm vertex to remove transient collinear singularities.
Haindl,Local form factor subtraction for three-loop QCD corrections to electroweak production in quark-antiquark annihilation,JHEP06(2025) 257 [2502.00572]
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General finite two-loop amplitude integrand for photoproduction in quark annihilation
The paper constructs a locally finite two-loop amplitude integrand for photoproduction in quark annihilation, using momentum-flow symmetrization and an antisymmetric counterterm vertex to remove transient collinear singularities.