Calabi-Yau Feynman integrals in gravity: ε-factorized form for apparent singularities

A bstract We study a recently identified four-loop Feynman integral that contains a three-dimensional Calabi-Yau geometry and contributes to the scattering of black holes in classical gravity at fifth post-Minkowskian and second self-force order (5PM 2SF) in the conservative sector. In contrast to previously studied Calabi-Yau Feynman integrals, the higher-order differential equation that this integral satisfies in dimensional regularization exhibits ε -dependent apparent singularities. We introduce an appropriate ansatz which allows us to bring such cases into an ε -factorized form. As a proof of principle, we apply it to the integral at hand.