One-Loop Calculations with BlackHat

One-Loop Calculations with BlackHat

C. F. Berger, Z. Bern, L. J. Dixon, F. Febres Cordero, D. Forde, H. Ita, D. A. Kosower, D. Mâıtre Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA Department of Physics and Astronomy, UCLA, Los Angeles, CA 90095-1547, USA Stanford Linear Accelerator Center, Stanford University, Stanford, CA 94309, USA Institut de Physique Théorique, CEA–Saclay, F–9...

Automated one-loop calculations with GoSam

In this talk, the program package GOSAM is presented which can be used for the automated calculation of one-loop amplitudes for multi-particle processes. The integrands are generated in terms of Feynman diagrams and can be reduced by d-dimensional integrand-level decomposition, or tensor reduction, or a combination of both. Through various examples we show that GOSAM can produce one-loop amplit...

Modern Techniques for One-Loop Calculations

We review the techniques used for one-loop calculations with emphasis on practical applications. QED is used as an example but the methods can be used in any theory. The aim is to teach how to use modern techniques, like the symbolic package FeynCalc for Mathematica and the numerical package LoopTools for Fortran or C++, in one-loop calculations.

Loop Calculations With

Automated one-loop calculations: a proof of concept

An algorithm, based on the OPP reduction method, to automatically compute any one-loop amplitude, for all momentum, color and helicity configurations of the external particles, is presented. It has been implemented using the tree-order matrix element code HELAC and the OPP reduction code CutTools. As a demonstration of the potential of the current implementation, results for all sub-processes i...