The Master Differential Equations for the 2-loop Sunrise Selfmass Amplitudes

Abstract

The master differential equations in the external square momentum p^2 for the master integrals of the two-loop sunrise graph, in n-continuous dimensions and for arbitrary values of the internal masses, are derived. The equations are then used for working out the values at p^2 = 0 and the expansions in p^2 at p^2 =0, in (n-4) at n to 4 limit and in 1/p^2 for large values of p^2 .

28 pages, Latex, 2 encapsulated Postscript figures with epsfig, mistype corrected in Eq.(56)

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