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Massive one-loop conformal Feynman integrals and quadratic transformations of multiple hypergeometric series
Phys. Rev. D 103, 096008 – Published 13 May, 2021
DOI: https://doi.org/10.1103/PhysRevD.103.096008
Abstract
The computational technique of -fold Mellin-Barnes (MB) integrals, presented in a companion paper by the same authors, is used to derive sets of series representations of the massive one-loop conformal three-point Feynman integral in various configurations. This shows the great simplicity and efficiency of the method in nonresonant cases (generic propagator powers) as well as some of its subtleties in the resonant ones (for unit propagator powers). We confirm certain results in the physics and mathematics literature and provide many new results, some of them dealing with the more general massive one-loop conformal -point case. In particular, we prove two recent conjectures that give the massive one-loop conformal -point integral (for generic propagator powers) in terms of multiple hypergeometric series. We show how these conjectures, that were deduced from a Yangian bootstrap analysis, are related by a tower of new quadratic transformations in hypergeometric functions theory. Finally, we also use our MB method to identify spurious contributions that can arise in the Yangian approach.
Physics Subject Headings (PhySH)
See Also
Multiple Series Representations of -fold Mellin-Barnes Integrals
Article Text
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