A non-planar two-loop three-point function beyond multiple polylogarithms

High Energy Physics - Theory Physics ddc:530 FOS: Physical sciences QC770-798 QCD Phenomenology 530 01 natural sciences High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) High Energy Physics - Theory (hep-th) Nuclear and particle physics. Atomic energy. Radioactivity NLO Computations 0103 physical sciences info:eu-repo/classification/ddc/530
DOI: 10.1007/jhep06(2017)127 Publication Date: 2017-06-24T07:13:45Z
ABSTRACT
27 pages, 1 figure, 1 ancillary file<br/>We consider the analytic calculation of a two-loop non-planar three-point function which contributes to the two-loop amplitudes for $t \bar{t}$ production and $����$ production in gluon fusion through a massive top-quark loop. All subtopology integrals can be written in terms of multiple polylogarithms over an irrational alphabet and we employ a new method for the integration of the differential equations which does not rely on the rationalization of the latter. The top topology integrals, instead, in spite of the absence of a massive three-particle cut, cannot be evaluated in terms of multiple polylogarithms and require the introduction of integrals over complete elliptic integrals and polylogarithms. We provide one-fold integral representations for the solutions and continue them analytically to all relevant regions of the phase space in terms of real function, extracting all imaginary parts explicitly. The numerical evaluation of our expressions becomes straightforward in this way.<br/>
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