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Volume 375 - 14th International Symposium on Radiative Corrections (RADCOR2019) - Formal
A new formulation of the loop-tree duality at higher loops
R. Runkel, Z. Szőr,* J.P. Vesga, S. Weinzierl
*corresponding author
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Pre-published on: 2019 December 19
Published on: 2020 February 18
We present a new formulation of the loop-tree duality theorem for higher loop diagrams valid both for massless and massive cases. $l$-loop integrals are expressed as weighted sum of trees obtained from cutting $l$ internal propagators of the loop graph.
In addition, the uncut propagators gain a modified $i \delta$-prescription, named dual propagators. In this new framework one can go beyond graphs and calculate the integrand of loop amplitudes as a weighted sum of tree graphs, which form a tree-like object.
These objects can be computed efficiently via recurrence relations.
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