Abstract
We describe the implementation of infrared subtractions for two-loop QCD corrections to quark-antiquark annihilation to electroweak final states. The subtractions are given as form-factor integrands whose integrals are known. The resulting subtracted amplitudes are amenable to efficient numerical integration. Our procedure is based on the universality of infrared singularities and requires a relatively limited set of subtractions, whose number grows as the number of two-loop diagrams, rather than with the number of singular regions of integration.
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Acknowledgments
We thank Julia Karlen, Yao Ma, Matilde Vicini and Mao Zeng for useful discussions. This research was supported in part by the National Science Foundation under Grants PHY-1915093 and PHY-2210533, by the Swiss National Science Foundation under contract SNF200021_179016 and by the European Commission through the ERC grant “pertQCD”.
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Anastasiou, C., Sterman, G. Locally finite two-loop QCD amplitudes from IR universality for electroweak production. J. High Energ. Phys. 2023, 242 (2023). https://doi.org/10.1007/JHEP05(2023)242
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DOI: https://doi.org/10.1007/JHEP05(2023)242