$\varepsilon$-factorized differential equations for two-loop non-planar triangle Feynman integrals with elliptic curves

TL;DR

This paper develops a method to derive epsilon-factorized differential equations for two-loop non-planar triangle Feynman integrals involving elliptic curves, enabling efficient evaluation and broad applicability in high-energy physics calculations.

Contribution

It extends the epsilon-factorization technique to complex elliptic Feynman integrals with non-trivial sub-sectors, generalizing previous methods for simpler integral families.

Findings

Derived epsilon-factorized differential equations for all sectors

Expressed results in terms of iterated integrals with uniform boundary conditions

Method can be generalized to other elliptic integral families

Abstract

In this paper, we investigate two-loop non-planar triangle Feynman integrals involving elliptic curves. In contrast to the Sunrise and Banana integral families, the triangle families involve non-trivial sub-sectors. We show that the methodology developed in the context of Banana integrals can also be extended to these cases and obtain $\varepsilon$-factorized differential equations for all sectors. The letters are combinations of modular forms on the corresponding elliptic curves and algebraic functions arising from the sub-sectors. With uniform transcendental boundary conditions, we express our results in terms of iterated integrals order-by-order in the dimensional regulator, which can be evaluated efficiently. Our method can be straightforwardly generalized to other elliptic integral families and have important applications to precision physics at current and future high-energy colliders.