Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-07-05
Phys.Atom.Nucl. 68 (2005) 1405-1413; Yad.Fiz. 68 (2005) 1461-1469
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTeX, 13 pages, 1 figure
Scientific paper
We consider two loop sunset diagrams with two mass scales m and M at the threshold and pseudotreshold that cannot be treated by earlier published formula. The complete reduction to master integrals is given. The master integrals are evaluated as series in ratio m/M and in epsilon with the help of differential equation method. The rules of asymptotic expansion in the case when q^2 is at the (pseudo)threshold are given.
Onishchenko A.
Veretin O.
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