25th International Workshop on Deep Inelastic Scattering and Related Topics

Latest developments in fastNLO interpolation grids

Not scheduled

17m

School of Physics and Astronomy (University of Birmingham)

WG1) Structure Functions and Parton Densities WG1 Structure Functions and Parton Densities

Speaker

Klaus Rabbertz (KIT - Karlsruhe Institute of Technology (DE))

Description

The fastNLO framework allows to efficiently re-evaluate very
time-consuming higher-order calculations in perturbative QCD
for different choices of the strong coupling constant and evolution,
parton distribution functions, or renormalisation and factorisation scales.

Originally, this technique was developed to permit the inclusion of
next-to-leading order jet cross sections into fits of parameters of the
standard model. At the time, about 1000 CPU hours were necessary for
one such computation. With the advent of many next-to-next-to-leading
order (NNLO) results including very recently jets at NNLO, the grid
interpolation technique has become even more important to reduce
the several 100k hours of CPU time for the NNLO parts by
more than 10^9 for a repeated evaluation as required in fits.

We report on our latest results and developments with fastNLO
interpolation grids for NNLO calculations.