Evaluating ‘elliptic’ master integrals at special kinematic values: using differential equations and their solutions via expansions near singular points.(English)Zbl 1395.81288

Summary: This is a sequel of our previous paper [the authors, J. High Energy Phys. 2018, No. 3, Paper No. 8, 15 p. (2018; Zbl 1388.81927)]] where we described an algorithm to find a solution of differential equations for master integrals in the form of an $$\epsilon$$-expansion series with numerical coefficients. The algorithm is based on using generalized power series expansions near singular points of the differential system, solving difference equations for the corresponding coefficients in these expansions and using matching to connect series expansions at two neighboring points. Here we use our algorithm and the corresponding code for our example of four-loop generalized sunset diagrams with three massive and tw massless propagators, in order to obtain new analytical results. We analytically evaluate the master integrals at threshold, $$p^2 = 9 m^2$$, in an expansion in $$\epsilon$$ up to $$\epsilon^1$$. With the help of our code, we obtain numerical results for the threshold master integrals in an $$\epsilon$$-expansion with the accuracy of 6000 digits and then use the PSLQ algorithm to arrive at analytical values. Our basis of constants is build from bases of multiple polylogarithm values at sixth roots of unity.

MSC:

 81V05 Strong interaction, including quantum chromodynamics 81U05 $$2$$-body potential quantum scattering theory

Zbl 1388.81927

Software:

GiNaC; HPL; FIRE; epsilon; Fuchsia; LiteRed; FIRE5; sunem
Full Text:

References:

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