The Threshold Expansion of the 2-loop Sunrise Selfmass Master Amplitudes

Abstract

The threshold behavior of the master amplitudes for two loop sunrise self-mass graph is studied by solving the system of differential equations, which they satisfy. The expansion at the threshold of the master amplitudes is obtained analytically for arbitrary masses.

Comments: 1+18 pages, Latex, no figures, as in Journal reference with more changes in Eq.(31),(42),(45)