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Constructing d-log integrands and computing master integrals for three-loop four-particle scattering

Author(s)
Henn, Johannes; Mistlberger, Bernhard; Smirnov, Vladimir A; Wasser, Pascal
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Abstract
Abstract We compute all master integrals for massless three-loop four-particle scattering amplitudes required for processes like di-jet or di-photon production at the LHC. We present our result in terms of a Laurent expansion of the integrals in the dimensional regulator up to 8th power, with coefficients expressed in terms of harmonic polylogarithms. As a basis of master integrals we choose integrals with integrands that only have logarithmic poles — called dlog forms. This choice greatly facilitates the subsequent computation via the method of differential equations. We detail how this basis is obtained via an improved algorithm originally developed by one of the authors. We provide a public implementation of this algorithm. We explain how the algorithm is naturally applied in the context of unitarity. In addition, we classify our dlog forms according to their soft and collinear properties.
Date issued
2020-04-24
URI
https://hdl.handle.net/1721.1/131705
Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Publisher
Springer Berlin Heidelberg
Citation
Journal of High Energy Physics. 2020 Apr 24;2020(4):167
Version: Final published version

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