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Leading-Color Two-Loop Amplitudes for Four Partons and a W Boson in QCD

MPS-Authors

Abreu,  S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Febres Cordero,  F.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Ita,  H.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Klinkert,  M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Page,  B.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Sotnikov,  V.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Citation

Abreu, S., Febres Cordero, F., Ita, H., Klinkert, M., Page, B., & Sotnikov, V. (2022). Leading-Color Two-Loop Amplitudes for Four Partons and a W Boson in QCD. Journal of High Energy Physics, 04, 042. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2021-181.


Cite as: https://hdl.handle.net/21.11116/0000-000C-B5A1-1
Abstract
We present the leading-color two-loop QCD corrections for the scattering of four partons and a $W$ boson, including its leptonic decay. The amplitudes are assembled from the planar two-loop helicity amplitudes for four partons and a vector boson decaying to a lepton pair, which are also used to determine the planar two-loop amplitudes for four partons and a $Z/\gamma^*$ boson with a leptonic decay. The analytic expressions are obtained by setting up a dedicated Ansatz and constraining the free parameters from numerical samples obtained within the framework of numerical unitarity. The large linear systems that must be solved to determine the analytic expressions are constructed to be in Vandermonde form. Such systems can be very efficiently solved, bypassing the bottleneck of Gaussian elimination. Our results are expressed in a basis of one-mass pentagon functions, which opens the possibility of their efficient numerical evaluation.