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001     620219
005     20250312224007.0
024 7 _ |a Papathanasiou:2025stn
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024 7 _ |a inspire:2867923
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024 7 _ |a arXiv:2501.07490
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024 7 _ |a 10.3204/PUBDB-2025-00092
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037 _ _ |a PUBDB-2025-00092
041 _ _ |a English
088 _ _ |a arXiv:2501.07490
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088 _ _ |a DESY-25-001
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088 _ _ |a MITP-25-004
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088 _ _ |a USTC-ICTS/PCFT-24-28
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100 1 _ |a Papathanasiou, Georgios
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245 _ _ |a Rationalisation of multiple square roots in Feynman integrals
260 _ _ |c 2025
336 7 _ |a Preprint
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336 7 _ |a WORKING_PAPER
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336 7 _ |a Electronic Article
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336 7 _ |a preprint
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336 7 _ |a ARTICLE
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500 _ _ |a 26 pages. Prepared for submission to JHEP
520 _ _ |a Feynman integrals are very often computed from their differential equations. It is not uncommon that the $\varepsilon$-factorised differential equation contains only dlog-forms with algebraic arguments, where the algebraic part is given by (multiple) square roots. It is well-known that if all square roots are simultaneously rationalisable, the Feynman integrals can be expressed in terms of multiple polylogarithms. This is a sufficient, but not a necessary criterium. In this paper we investigate weaker requirements. We discuss under which conditions we may use different rationalisations in different parts of the calculation. In particular we show that we may use different rationalisations if they correspond to different parameterisations of the same integration path. We present a non-trivial example -- the one-loop pentagon function with three adjacent massive external legs involving seven square roots -- where this technique can be used to express the result in terms of multiple polylogarithms.
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536 _ _ |a DFG project G:(GEPRIS)390783311 - EXC 2094: ORIGINS: Vom Ursprung des Universums bis zu den ersten Bausteinen des Lebens (390783311)
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700 1 _ |a Weinzierl, Stefan
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700 1 _ |a Wu, Konglong
|0 P:(DE-H253)PIP1104658
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700 1 _ |a Zhang, Yang
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856 4 _ |u https://bib-pubdb1.desy.de/record/620219/files/HTML-Approval_of_scientific_publication.html
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910 1 _ |a Deutsches Elektronen-Synchrotron
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913 1 _ |a DE-HGF
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914 1 _ |y 2025
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