Speaker
Dr
Andreas van Hameren
(IFJ-PAN, Krakow)
Description
In order to deal with the data from the experiments at LHC for the
study of elementary particles, signals and potential backgrounds for
new physics have to be under control at sufficient accuracy. In
particular, hard processes with high multiplicities, involving many
particles or partons, cannot be neglected. On top of that, such
processes have to be dealt with at the next-to-leading order (NLO)
level to, for example, reduce the scale dependence of observables and
to have a better description of the shape of their distributions.
Several fully automatized programs exist to perform leading order
calculations for any hard scattering process. At NLO, several
calculations exist for multiplicities up to 7 external particles, but
no automatic tools to achieve this for arbitrary processes. The
calculation of one-loop amplitudes, necessary in any NLO
calculation, is a major bottleneck. An algorithm is presented, to
automatically compute any one-loop amplitude, for all momentum, color
and helicity configurations of the external particles.
Primary author
Dr
Andreas van Hameren
(IFJ-PAN, Krakow)
