Speaker
Dhimiter Canko
(NSCR "Demokritos")
Description
We present an extension of HELAC for two-loop amplitudes. All basic two-loop topologies (Theta, Infinity, Dumbbell) are included in the skeleton construction. For colored particles, the color-connection representation is extended to two loops offering a unified framework for tree-order, one- and two-loop amplitudes. HELAC-2LOOP provides, at the moment, an automated algorithm capable to compute two-loop amplitudes at the integrand level. Several tests have been performed regarding 2-to-2 and 2-to-3 processes against publically available packages such as QGRAF, FeynArts, FeynCalc, and FORM. The reduction to a master integral basis is currently under study.
