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Ward identity preserving local ultraviolet counterterms for photoproduction at two loops in QCD
Charalampos Anastasiou, Julia Karlen, Roshni Sahoo +2
We review the construction of locally finite two-loop amplitude integrands for photoproduction via quark annihilation, presented in arXiv:2509.07805. Building on established techni…
Axial triangles in at two loops in QCD directly in four dimensions
Dario Kermanschah, Matilde Vicini
We numerically evaluate the two-loop QCD squared matrix element for in and with heavy top and bottom quarks circulating in a triangular fermion loo…
Heavy-quark box-loop corrections to at two loops in QCD
Dario Kermanschah, Matilde Vicini
We numerically compute the two-loop QCD corrections to production at the LHC mediated by light- and heavy-quark box loops. The calculation employs the pipeline of refs. arXiv:…
Two-loop QCD corrections for real and off-shell diphoton and triphoton production via quark loops
Dario Kermanschah, Matilde Vicini
We compute squared matrix elements at next-to-next-to-leading order in perturbative quantum chromodynamics for the production of two or three (on- or off-shell) photons mediated vi…
General finite two-loop amplitude integrand for photoproduction in quark annihilation
Charalampos Anastasiou, Julia Karlen, Roshni Sahoo +2
The construction of integrands free of infrared and ultraviolet singularities may enable the application of numerical methods to evaluate loop amplitudes that are inaccessible with…
Numerical integration of the double- and triple-box integrals using threshold subtraction
Dario Kermanschah, Matilde Vicini
We numerically integrate finite two- and three-loop scalar integrals using the threshold subtraction method. This represents a first step towards extending our calculation of the $…
Nf-contribution to the virtual correction for electroweak vector boson production at NNLO
Dario Kermanschah, Matilde Vicini
Multi-loop scattering amplitudes are difficult to evaluate due to singularities of the integrals involved, especially with increasing number of loops, external legs, and mass scale…
Tensor reduction of loop integrals
Charalampos Anastasiou, Julia Karlen, Matilde Vicini
The computational cost associated with reducing tensor integrals to scalar integrals using the Passarino-Veltman method is dominated by the diagonalisation of large systems of equa…