Hypergeometric representation of a four-loop vacuum bubble

Bejdakic E, Schroeder Y. Hypergeometric representation of a four-loop vacuum bubble. In: Nuclear Physics B - Proceedings Supplements. Nucl.Phys.Proc.Suppl. Vol 160. Elsevier; 2006: 155-159.In this article, we present a new analytic result for a certain single-mass- scale four-loop vacuum (bubble) integral. We also discuss its systematic c-expansion in d = 4-2 is an element of as well as d = 3-2 is an element of dimensions, the coefficients of which are expressible in terms of harmonic sums at infinity