Abstract
The differential equation in the external invariant p 2 satisfied by the master integral of the general massive 2-loop 4-denominator self-mass diagram is exploited and the expansion of the master integral at p 2=0 is obtained analytically. The system composed by this differential equation with those of the master integrals related to the general massive 2-loop sunrise diagram is numerically solved by the Runge–Kutta method in the complex p 2 plane. A numerical method to obtain results for values of p 2 at and close to thresholds and pseudo-thresholds is discussed in details.
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