Banana integrals in configuration space

We reconsider the computation of banana integrals at different loops, by working in the configuration
space, in any dimension. We show how the 2-loop banana integral can be computed directly from the
configuration space representation, without the need to resort to differential equations, and we include
the analytic extension of the diagram in the space of complex masses. We also determine explicitly the ε
expansion of the two loop banana integrals, for d = j − 2ε, j = 2, 3, 4.