Attacking One-loop Multi-leg Feynman Integrals with the Loop-Tree   Duality
  We discuss briefly the first numerical implementation of the Loop-Tree Duality (LTD) method. We apply the LTD method in order to calculate ultraviolet and infrared finite multi-leg one-loop Feynman integrals. We attack scalar and tensor integrals with up to six legs (hexagons). The LTD method shows an excellent performance independently of the number of external legs. 
Grigorios Chachamis, Sebastian Buchta, Petros Draggiotis, German   Rodrigo
hep-ph