Virtual and real processes, the Källén function, and the relation to dilogarithms
arXiv:1404.7714 · doi:10.1088/0954-3899/42/8/085003
Abstract
We enlighten relations between the Källén function, allowing in a simple way to distinguish between virtual and real processes involving massive particles, and the dilogarithms occurring as results of loop calculations for such kind of processes.
12 pages, 5 figures, published version